Translator Disclaimer
1 December 2012 Palynology and Microfacies of Lower Devonian Mixed Carbonate-Siliciclastic Deposits in Podolia, Ukraine
Paweł Filipiak, Michał Zatoń, Hubert Szaniawski, Ryszard Wrona, Grzegorz Racki
Author Affiliations +
Abstract

Investigation of mixed carbonate-siliciclastic Lower Devonian deposits have been carried out in the Ivanye Zolote and Ustechko sections in Podolia, Ukraine. Based on palynomorph evidence, the age of the samples studied is late Lochkovian, not older than the NM Oppel Miospore Zone, specifically the Si Lineage Zone. The presence of acritarchs and chitinozoans points to dominantly marine depositional conditions. However, a regressive environmental change to-ward more brackish conditions is indicated by a decrease in the taxonomic diversity of acritarchs in the topmost samples, the simultaneous disappearance of chitinozoans, and an increase in leiosphaerid frequency. Furthermore, evolution of limestone microfacies demonstrates a progressive transition from a shrinking marine basin toward a brackish, storm-af-fected muddy lagoon, manifested by recurrent profusion of impoverished, mostly opportunistic and euryhaline shelly benthos (nuculanid bivalves, leperditicopids and other ostracods, terebratulid brachiopods), chaetetid demosponges and diverse ichthyofauna. The association of plant (mainly nematophytes and some tracheids) and animal (eurypterid, ?scor-pion, and possibly other arthropod) remains points to the presence of nearby Early Devonian wetland vegetation, provid-ing food and shelter for various semi-aquatic and other terrestrial arthropods.

Introduction

Upper Silurian and Lower Devonian deposits occur as many natural exposures in the Podolia region of Ukraine (Fig. 1). However, biostratigraphic subdivision of the sedimentary successions remains unsatisfactory, especially of those strata deposited during the late Lochkovian, when conditions changed from marginal marine to alluvial (Uchman et al. 2004; Małkowski et al. 2009; Drygant 2010; Voichyshyn 2011). Palynological studies have proven useful for subdi-viding and correlating various sedimentary facies, as well as can also assist in interpreting changes in sedimentary envi-ronments (e.g., Tyson 1993; Batten 1996; Wicander and Wood 1997; Filipiak 2002; Filipiak and Zatoń 2011). In Podolia, such integrative palynological analyses are espe-cially needed (Le Herisse et al. 1997) to decipher the evolu-tion of sedimentary conditions during this regressive Early Devonian interval, supplementing the sedimentological-eco-logical data provided by Uchman et al. (2004).

Kirjanov (1978) presented comprehensive data concerning phytoplankton (mainly acritarch) distribution in the Silurian of the Volyno-Podolia region. He described over 70 species, some of which were recognized during the current study. Arkhangelskaya (1980) identified such miospores as Em-phanisporites cf. micrornatus and Streelispora sp. from the Ivanye Horizon, indicative of the middle and upper parts of the Emphanisporites micrornatusStreelispora newportensis Spore Zone of Richardson and McGregor (1986). Based on the presence of Emphanisporites micrornatus, Richardson et al. (1981) and Richardson and McGregor (1986) assigned the Ivanye Horizon to the NM Miospore Zone. Paris and Grahn (1996) studied chitinozoans of Přidoli and Lochkovian beds of Podolia and tentatively dated their youngest low-diversity Ancyrochitina-dominated assemblage, from the Ivanye Hori-zon, as Lochkovian. Palynostratigraphic data from two sam-ples from the Ustechko section were presented by Turnau in Uchman et al. (2004). Based on the presence ofmiospore taxa, Turnau recognized the Lochkovian Emphanisporites micrornatusStreelispora newportensis Miospore Zone. In the phy-toplankton assemblage she only noticed the occurrence of Leiosphaeridia and Lophosphaeridium. The presence of amorphous organic matter and plant tissues was mentioned by Uchman et al. (2004).

Fig. 1.

A. Location of study area in Ukraine. B. Detailed map of study area in Podolia, showing locations of outcrop sections. Numbers of sections af-ter Nikiforova et al. (1972).

f01_863.jpg

Fig. 2.

A. Stratigraphical subdivision of the Lower Devonian in Podolia, Ukraine (Drygant 2010). B. Correlation of miospore and conodont zonal schemes (see the updated biostratigraphy in Becker et al. 2012). Dashed area on B presents palynostratigraphy; dotted lines—approximate correlation. Abbreviations: BZ, Breconisporites breconenesisEmphanisporites zavallatus; E, Dictyotriletes emsiensis; G, Emphanisporites zavallatus var. gedinniensis;M, Emphanisporites micrornatus var. micrornatus; MN, Emphanisporites micrornatusStreelispora newportensis; N, Streelispora newportensis; Pa, Camarozonotriletes parvus; Po, Verrucosisporites polygonalis; PoW, Verrucosisporites polygonalisDibolisporites wetteldorfensis; R, Chelinospora retorrida; Si, Emphanisporites micrornatus var. sinuosus; Su, Dictyotriletes subgranifer; W, Dibolispories wetteldorfensis; Z, Emphanisporites zavallatus; Lin., Lineage; Z., Zone.

f02_863.jpg

The aim of the present paper is to establish a palyno-stratigraphic framework and to characterize, in the paleo-environmental context, the palynofacies and carbonate micro-facies in the upper part of the Lochkovian deposits of Podolia. In particular, analysis of associations of marine and land-de-rived palynoflora, as well as plant and animal cuticle remains, refines interpretation of the development of marginal-marine facies in the section under study.

Institutional abbreviations.—GIUS, Faculty of Earth Sci-ences, University of Silesia, Sosnowiec, Poland.

Other abbreviations.—AOM, amorphic organic matter; CH., chitinozoa; IZ, Ivanye Zolote; LEIO., leiospheres.

Geological setting

Lower Devonian deposits of the Dniester Basin are located on the southwestern margin of the East European Platform(Fig. 1; Nikiforova et al. 1972; Małkowski et al. 2009; Drygant 2010). Their lower part, about 530 mthick, comprises an open marine sedimentary sequence, the Tyver Series (Fig. 2A). This unit is composed mainly of shale and siltstone beds with irregular limestone interbeds and passes upwards into terrigenous, mar-ginal-marine and fluvial facies of the Old Red Sandstone-type referred to as the Dniester Series (Nikiforova et al. 1972; Abushik et al. 1985; Małkowski et al. 2009; Drygant 2010; Voichyshyn 2011). All the deposits are well exposed at many localities along the Dniester River valley and its tributaries. Their stratigraphy has been based on abundant and diverse in-vertebrate fossils, abundant fish remains and microfossils, which have been extensively studied since the 19th century (see Kozłowski 1929; Nikiforova et al. 1972; Drygant 2010; Voychyshyn 2011; Olempska 2012; Olempska et al. 2012). The open marine sediments are most probably of Lochkovian age. However, the precise stratigraphic position of their bound-arywith the overlying red beds of theDniester Series is still un-der discussion (Drygant and Szaniawski 2012). The problem is complicated by diachronism caused by gradual shrinking of the marine basin and its shifting toward the west. The Tyver Series is biostratigraphically and lithostratigraphically subdi-vided into three units: in ascending order, the Borshchiv, Chortkiv and Ivanye horizons and beds (Fig. 2A). Only the up-permost part of the Ivanye Horizon/Beds (ca. 30 m thick) has been sampled for the palynofacies analysis. The youngest ma-rine deposits, passing gradually into the Old Red facies, are well exposed near the village of Ivanye Zolote, and in part also near Ustechko (Fig. 1), at the locality studied by Uchman et al. (2004). The Ivanye Zolote section is ca. 25 m thick, whereas near Ustechko only the uppermost 5 m were available for sam-pling (Fig. 3). The argillaceous content gradually increases up-wards in both of the outcrops. The “calcareous interbeddings” within the uppermost part in fact contain only a small admix-ture of calcium carbonate. As shown by geochemical analyses (7 samples) of the coeval facies transition at nearby Zalishchyky locality (Fig. 1B; section 58 in Małkowski et al. 2009; Voichyshyn 2011), the CaCO3 content drops upwards from ca. 80% to less than 2%, whilst quartz (SiO2) and alumi-nosilicate (Al2O3) levels increase simultaneously from ca. 10% and 2% to above 50% and 15%, respectively; total organic car-bon (TOC) content for 3 samples is between 0.17 and 0.22% (see details in Racki et al. 2012: SOM 3 and 4).

Fig. 3.

A. Composite lithological log of the Lower Devonian deposits in Ivanye Zolote and Ustechko sections; indicating the samples (dotted lines) and thin sections (solid lines) stratigraphic position. B. Ivanye Zolote out-crop section photograph. Upper part of the Ivanye Beds showing typical lithology of alternating bedded limestone and siltstone beds.

f03_863.jpg

The diversity and number of macrofossils mostly bi-valves, brachiopods, and nautiloids, gradually decrease up the section (Nikiforova et al. 1972; see below). However, most of the microfossils (ostracods, conodonts, scoleco-donts, chitinozoans, nematophytes, and prasinophytes) are still abundant, even in the uppermost “calcareous layers” (Fig. 3). Phosphatic fish scales and spines are very abundant, and in some layers fragments of acanthodian jaws are com-paratively well preserved (Voichyshyn 2011; Voichyshyn and Szaniawski 2012). The uppermost gray-coloured and marine in origin beds of the Tyver Series can easily be distin-guished from the overlying pink or red “Old Red” rocks.

Material and methods

In total, twenty three samples were collected from the two lo-calities. Ten of them were taken mainly from marly limestone layers for the palynological investigation—eight from the ∼25 m thick interval of the Ivanye Zolote (IZ) section and two from the ∼5 m thick Ustechko section (Fig. 3). An additional ten samples from the Ivanye Zolote section were studied in large-sized (4.5 ~ 6.5 cm) thin sections. Eight of them repre-sent calcareous layers and two of them represent the Old Red facies (Fig 3). Three additional samples (IZ10–IZ12) have been studied with respect to chitinozoans exclusively.

Standard laboratory procedures for palynological samples containing mineral matter were employed (Wood et al. 1996). Samples were treated using palynological HCl-HF-HCl acid maceration techniques. The organic residue obtained was fi-nally sieved using an 18 ìm mesh nylon sieve. At least four slides were prepared from each residue. The preservation of palynomorphs from Ivanye Zolote varies in quality. Some samples are completely weathered (IZ-3), some are partly weathered (IZ-6) but generally the state of preservation of organics in the rest of the samples analysed is good, especially those from the lower part of the section. Generally, microflora derived from the Ivanye Zolote is moderately rich in taxonom-ically differentiated assemblages of miospores and phyto-plankton taxa. Some plant tracheids, scolecodonts, chitino-zoans, and arthropod remains were noticed, as well. The worst preserved and less taxonomically differentiated material have been derived from the Ustechko outcrop. Phytoplankton is better represented here but miospores are rare and possess less stratigraphic value. Therefore, those two samples were ex-cluded from further quantitative analyses.

For quantitative palynofacies analyses, each countable kerogen component from the samples from the IZ section was counted for up to 100 specimens. The relative frequency of cryptospores, miospores, acritarchs, chitinozoans, and leiospheres was noted. The remaining slides were examined for the presence of other components that had not been iden-tified in the previously examined portions. Furthermore, oc-currences of amorphous organic matter (AOM), miospore tetrads and arthropod remains were noted, as well.

The palynological slides and residues are housed at GIUS. Examination and documentation was done using the Nikon Eclipse 50i transmitted light microscope. The stratigraphically important miospores and phytoplankton taxa are illustrated on Figs. 4, 7; other plant, animal remains, and some chitinozoans are showed on Figs. 5, 8, 9.

Palynostratigraphy

The presence of several characteristic and eponymous spe-cies for the Lower Devonian (Table 1) permits to assign the miospore assemblages to the assemblage zones of Richard-son and McGregor (1986), and the Oppel and interval/lin-eage zones of Steemans (1989; Streel et al. 1987; Fig. 2B). The latter division is more detailed and useful for the finer biostratigraphy and therefore will be employed in this paper.

Ivanye Zolote.—Based on the presence of eponymous and characteristic miospore species, the Lochkovian MN Oppel Zone that corresponds to the Emphanisporites micrornatusStreelispora newportensis Assemblage Zone has been recog-nized (Fig. 2B). Emphanisporites micrornatus var. micro-rnatus the index species of the NM Oppel Zone is present in the lowermost analysed sample but Streelispora newpor-tensis has not been detected in the material analysed. The presence of Amicosporites jonkeri in the lowermost sample is also important. According to Steemans (1989), its first ap-pearance marks the base of the Si Lineage Zone (Fig. 2B), at-tributed to upper Lochkovian, which tentatively corresponds to the Latericriodus woschmidti/postwoschmidtiAncyrodel-loides delta conodont zones (House and Gradstein 2004); however, Drygant and Szaniawski (2012) dated the upper part of IZ Horizon, according to present zonation, as the Pedavis gilbertiCaudicrodus steinachensis Conodont Zone (guided by uncommon species Pandorinellina praeoptima, Zieglerodina serrula, and Caudicriodus serus). Microspore species defining the base of the next succeeding palyno-logical zone (BZ Oppel Zone) were not encountered.

The assemblage is moderately taxonomically diverse. Cryptospores are not diverse and represented by ca. 20—40% of all kerogen components. Among miospores the most commonly occurring taxa are Archaeozonotriletes chulus, Cym-bosporites sp., Retusotriletes dubiosus, and R. triangulatus. Less common are Apiculiretusispora plicata, Chelinospora retorrida, Cymbohilates pusillius, Emphanisporites neglec-tus, and Leonispora argovejae (Fig. 4; Table 1). According to Richardson and McGregor (1986), Apiculiretusispora pli-cata is an important miospore for the E. micrornatusS. newportensis, the stratigraphical equivalent for theNMZone (Fig. 2); moreover, according to Turnau (1986) also impor-tant is the presence of Chelinospora retorrida which does not extend above the Lochkovian. The stratigraphical range of these taxa is well known from SE Poland (Turnau 1986). Among cryptospores, frequent were: Artemopyra recticosta, Chelinohilates glabrimarginatus, Gneudnaspora divello-media, and Gneudnaspora plicata (Fig. 4). Quadrisporites, previously treated as miospore but recently classified as nonmarine or brackish acritarch or algal fossils by Le Herisse et al. (2009), were noticed as well.

Table 1.

Distribution of some frequent and important spore and phyto-plankton taxa in the sections investigated.

t01_863.gif

Fig. 4.

Miospores from the Ivanye Zolote section. GIUS 4-3592. A. Gneudnaspora divellomedia (Chibrikova) Balme, 1988; IZ-1 sample. B. Gneudnaspora plicata (Burgess and Richardson) Breuerr, Al-Ghazi, Al-Ruwaili, Higgs, Steemans, and Wellman, 2007; IZ-4 sample. C. Gneudnaspora plicata (Burgess and Richardson) BreuerAl-Ghazi, Al-Ruwaili, Higgs, Steemans, and Wellman, 2007; IZ-2 sample. D. Chelinohilates glabrimarginatus (Turnau and Jakubowska) Turnau, 2003; IZ-7 sample. E. Tetrahedraletes medinensis (Strother and Traverse) Wellman and Richardson,1993; IZ-4 sample. F. Chelino-spora retorrida Turnau, 1986; IZ-1 sample. G. Leonispora argovejae Cramer and Diez, 1975; IZ-1 sample. H. Unidentified; IZ-8 sample. I. Archaeo-zonotriletes chulus (Cramer) Richardson and Lister, 1969; IZ-1 sample. J. Quadrisporites sp.; IZ-1 sample. K. Emphanisporites cf. rotatus (McGregor) McGregor, 1973; IZ-4 sample. L. Emphanisporites var. micrornatus Steemans and Gerrienne, 1984; IZ-1 sample. M. Retusotriletes triangulatus (Streel) Streel, 1967; IZ-1 sample. N. Calamospora atava McGregor, 1973; IZ-1 sample. O. Apiculiretusispora plicata Allen, 1965; IZ-6 sample. P. Apiculi-retusispora spicula Richardson and Lister, 1969; IZ-4 sample. Q. Amicosporites jonkeri (Riegel) Steemans, 1989; IZ-1 sample. R. Camptozonotriletes sp.; IZ-4 sample. S. Diad; IZ-4 sample. T. Emphanisporites epicautus Richardson and Lister, 969; IZ-4 sample.

f04_863.jpg

Four of seven samples prepared from the Ivanye section contain a moderately well preserved chitinozoan assemblage comprising Calpichitina sp. cf. C. velata; Angochitina filosa; Sphaerochitina sp. aff. S. densibaculata (Fig. 5). This poorly diversified assemblage, however, represents species occurring in the upper Lochkovian up to the lowermost Pragian (Paris et al. 2000). Chitinozoan vesicles are compressed, deformed, of-ten with partly destroyed ornamentation and broken spines. The abundance in the studied samples ranges from a several dozens of specimens in the lowermost sample (IZ-1) and de-creases up to a few specimens in the upper-lying sample (IZ-5) in the section. Three uppermost samples (IZ-6, IZ-7, IZ-8) were barren of Chitinozoa. The observed pattern of the chitinozoan distribution is also consistent with a frequency pattern in adjacent contemporaneous Early Devonian se-quences in Poland (Wrona 1980), Barrandian region (Paris et al. 1981; Chlupač et al. 1985; Chlupač and Hladil 2000), and many other different areas (Paris et al. 2000).

Fig. 5.

Chitinozoans from the Ivanye Zolote section, GIUS 4-3592. A, B. Calpichitina sp. cf. C. velata (Wrona, 1980); IZ-1 sample. C. Angochitina filosa Eisenack, 1955; IZ-4 sample. D. Sphaerochitina sp. aff. S. densi-baculata Volkheimer, Melendi, and Salas, 1986; IZ-4 sample.

f05_863.jpg

Ustechko.—The land-derived microflora is poorly represen-ted only in the two uppermost samples analysed (Uo-2 and Uo-4; Fig. 3, Table 1). Any important miospores for strict microfloristic horizons were not recognized. The assemblage consists of miospores and cryptospores with broad strati-graphical ranges. Among them such species were recognized as: Ambitisporites sp., Archaeozonotriletes chulus, Emphani-sporites sp., Gneudnaspora divellomedia, and Retusotriletes dubiosus (Fig. 4, Table 1). The lack of eponymous and charac-teristic taxa precludes assignment to a biozone; the presence of the species mentioned above is rather characteristic for the broad Upper Silurian—Lower Devonian interval (Richardson and McGregor 1986; Rubinstein and Steemans 2002).

Palynofacies from the Ivanye Zolote section

Organic matter preserved in the samples comprises two com-ponents: (i) autochthonous, represented by acritarchs, leio-spheres, chitinozoans, and scolecodonts, and (ii) allochtho-nous, represented by miospores and land plant cuticles and tra-cheids. Animal remains probably belonging to semi-aquatic creatures like eurypterids form the third category. All those particles are mixed and appear in different relative frequency. The proportions of miospores, acritarchs, leiospheres, and chitinozoans are shown in Fig. 6.

Miospores are represented by spores and cryptospores. Their relative proportion ranges from ca. 40% to 80% of all countable components. Cryptospores appear slightly more than spores. The most frequently appearing and im-portant taxa arementioned in the palynostratigraphic chapter.

Taxonomically differentiated acritarchs are represented by ca. 5% in the IZ-4 sample to over 50% of all countable components in the IZ-2 sample. The assemblage is more dif-ferentiated in bottom samples (IZ-1–5; Table 1). Frequently appear acritarchs like: Baltisphaeridium scabrosum, Dictyo-tidium eurydictyotum, Elektoriskos sp., Geron gracilis, G. guerillerus, Helosphaeridium guttatum, H. microclavatum, Multiplicisphaeridium cf. raspa, Oppilatala cf. Oppilatala vulgaris, Riculasphaera fissa, Tyligmasoma alargadum, and Veryhachium trispinosum “complex” (see Fig. 7; Table 1). Small acritarchs with short spines (Helosphaeridium type) are more frequent in samples from the top of the section (IZ-8).

Prasinophyta are represented by Leiosphaeridia spp. Their relative frequency constantly increases, reaching ca. 8% in the upper part of the section. They are more frequently represented in the upper part of the section as compared to its lower part. Chitinozoans, on the other hand, are more fre-quent in the lower part and nearly absent in the upper part of the section investigated. Their maximum frequency was noticed in the IZ-1 sample, reaching ca. 8%. Also scolecodonts, and other animal cuticles, including the parts of eurypterid respiratory organs, accompanied by land-derived plant de-bris were noticed in the kerogen. The presence of AOM was noticed only in the topmost IZ-8 sample (Fig. 6).

Fig. 6.

Percentages of kerogen components in the Ivanye Zolote section. Abbreviations: AOM, amorphous organic matter; LEIO., leiospheres; CH., chitinozoa.

f06_863.jpg

Fig. 7.

Phytoplankton from the Ivanye Zolote section. GIUS 4-3592. A. Multiplicisphaeridium cf. M. raspa (Cramer) Wicander, 1986; IZ-4 sample. B. Multiplicisphaeridium cf. M. raspa (Cramer) Wicander, 1986; IZ-4 sample. C. Veryhachium trispinosum (Eisenack) Deunff, 1954; IZ-4 sample. D. Riculasphaera fissa Loeblich and Drugg, 1968; IZ-5 sample. E. Helosphaeridium cf. guttatum Playford, 1981; IZ-4 sample. F. Helosphaeridium microclavatum Playford, 1981; IZ-1 sample. G. Elektoriskos sp.; IZ-4 sample. H. Dictyotidium eurydictyotum Kirjanov, 1978; IZ-8 sample. I. Balti-sphaeridium scabrosum Kirjanov, 1978; IZ-8 sample. J. Ammonidium cf. A. garrasinoi Ottone, 1996; IZ-1 sample. K. Tyligmasoma alargadum (Cramer) Playford, 1977; IZ-4 sample. L. Oppilatala cf. O. vulgaris Loeblich and Wicander, 1970; IZ-4 sample. M. Baltisphaeridium sp.; IZ-1 sample. N. Elektoriskos sp; IZ-1 sample. O. Helosphaeridium sp.; IZ-1 sample. P. Dictyotidium eurydictyotum Kirjanov, 1978; IZ-8 sample. Q. Geron guerillerus Cramer, 1966 ex Cramer, 1969; IZ-4 sample. R. Geron gracilis Cramer, 1969; IZ-4 sample. S. Elektoriskos cf. E. brevispinosum Vanguestaine, 1979; IZ-5 sample. T. Synsphaeridium sp.; IZ-1 sample.

f07_863.jpg

Fig. 8.

Plant cuticles and tracheids from the Ivanye Zolote section. GIUS 4-3592. A. Cosmochlaina verrucosa Edwards, 1986; IZ-7 sample. B. Nemato-thallus sp.; IZ-7 sample. C. Nematothallus sp.; IZ-1 sample. DG. Nematothallus? like structures. D, E. IZ-6 sample. F, G. IZ-1 sample. HI. Porcati-tubulus annulatus Burges and Edwards, 1991. H. IZ-5 sample. I. IZ-4 sample. J. Laevitubulus sp.; IZ-1 sample. K. Porcatitubulus annulatus Burges and Edwards, 1991; IZ-5 sample.

f08_863.jpg

Among plant particles, sheets of enigmatic Nematothallus sp. were more frequently noticed than those of Cosmochlaina sp. (Fig. 8A–C). Plant tubes and filaments were mainly repre-sented by Laevitubulus spp., Porcatitubulus spiralis, and P. annulatus tissue (Fig. 8H, I, K). Paris and Grahn (1996: pl. 2: 7–9) also documented the presence of Porcatitubulus taxa from the Ivanye Beds. Some cuticles were encountered, but none had stomata like those of higher plants. Similar cuticles of enigmatic taxa were recently noticed in the marginal-ma-rine/alluvial clastic Pragian—Emsian deposits from southern Poland (Filipiak 2011; Filipiak and Zatoń 2011).

Animal cuticle remains

The most numerous animal cuticle remains are of arthropod origin well known from the Podolian Upper Silurian to Lower Devonian localities (e.g,. Krzemiński et al. 2010). They are often characteristically folded, possess irregularly distributed pores, setae, and spines, or may be stiffened. In that manner they differ from the associated plant cuticles (e.g., Gensel et al. 1990; see also Filipiak and Zatoń 2011). None of the animal cuticles are found to be associated with any larger diagnostic part of arthropod exoskeleton, so many of them are difficult to be unequivocally assigned to a particular group of arthropod animal. Only some character-istic respiratory organs allow identification as belonging to eurypterids that are known to occur in the strata studied (see Voichyshyn 2011). In transmitted light, the cuticles are translucent yellowish-brown in appearance.

Eurypterid respiratory organs.—These are the most char-acteristic animal structures present in the material investi-gated (Fig. 9B–D). They are represented by conical struc-tures (spinules) that usually occur as single individuals (Fig. 9B, C) and very rarely as grouped structures (Fig. 9D). Usually, they are preserved as fragments. The best preserved (?complete) spinule is ca. 175 ìm in length and ca. 100 ìm in width. Two morphological varieties of spinules are present: (i) conical, with a wide base and narrow top ended with a distinct spine (Fig. 9B), and (ii) oval in outline, with well-rounded top devoid of a spine, slowly widening toward its base (Fig. 9C). The entire surface of spinules is covered by thin microscopic cuticular projections, ca. 10 ìm in length and ca. 10 ìm in width (Fig. 9B, C). The projections are dis-tinctly arranged in groups of six, forming a hexagon that is internally empty (Fig. 9B) (see also Manning and Dunlop 1995; Filipiak and Zatoń 2011).

Fig. 9.

Animal cuticles, spines and respiratory organs from the Ivanye Zolote section; GIUS 4-3592. A. Stiff conical structure of uncertain affinity; IZ-1 sample. BD. Eurypterid respiratory organs. B. IZ-7 sample. C. IZ-4 sample. D. IZ-5 sample. E. Setae of uncertain affinity detached from cuticle surface; IZ-7 sample. F, H. Cuticles with meandering structures of possible eurypterid affinity; IZ-5 sample. G. Folded cuticle fragment with wrinkles of uncertain affinity; IZ-5 sample. I. Structure similar to scorpion claw; IZ-4 sample. J. Eurypterid cuticle fragment with crescent-shaped lunules; IZ-5 sample.K. Eury-pterid cuticle fragment with raised, elliptical openings; IZ-4 sample.

f09_863.jpg

Our spinules are very similar to those described from Up-per Silurian and Lower Devonian by Manning and Dunlop (1995) and Filipiak and Zatoń (2011), and interpreted as eurypterid accessory air-breathing respiratory organs (Kie-menplatten or “gill tracts”, see Manning and Dunlop 1995 and references cited therein). Those spinules possessing a spine at their top are especially similar to those from the Up-per Silurian (Manning and Dunlop 1995). The latter may only differ in having somewhat more robust spines. Those that are spine-less and have rounded top, on the other hand, are most similar to those described recently by Filipiak and Zatoń (2011) from the Lower Devonian of Poland. Although morphologically different, it is not excluded that the both forms of spinules described here may have belonged to the same eurypterid species, as such grouped spinules consisting of both spiny and spine-less forms are known from the Emsian—Eifelian of Saudi Arabia (Breuer 2007).

Eurypterid and ?scorpion cuticles.—The dispersed arthro-pod cuticle fragments studied have more or less folded sur-face showing pores, spines and tooth-like projections. How-ever, as all of them are dissociated from the larger diagnostic parts of the exoskeleton and as their ornamentation may dif-fer between different exoskeletal parts (e.g., Wills 1959; Tollerton 1989; Jeram 1994), their unequivocal determina-tion to a specific arthropod group is difficult.

Some of the cuticle remains, however, possess features identical or very similar to other cuticle remains previously illustrated in the literature. Thus, at least some of them may be classified with a greater confidence.

The cuticles having characteristic crescent-shaped foldings (lunules) on the surface (Fig. 9J) can be found in eurypterid (e.g., Eurypterus, Pterygotus) cuticles illustrated by Clarke and Ruedemann (1912) from the Silurian of the New York State. They were also described and illustrated by Taugourdeau (1967) from Silurian—Devonian of Africa, as belonging to eurypterids. The same concerns the cuticle fragments with dis-tinct raised, elliptical openings (Fig. 9K) presented by Tau-gourdeau (1967) as true eurypterid cuticles. Structures similar to the latter were also found in the Lower Devonian of Scot-land. They were figured, but not discussed further (Wellman 1995). Such structures were also recently described and illus-trated by Filipiak and Zatoń (2011) from the Lower Devonian of Poland. The cuticles showing characteristic meandering structures on the surface (Fig. 9F, H) somewhat resemble the cuticle ornamentation present in the eurypterid Tylopterus (see Clarke and Ruedemann 1912: 217, fig. 42).

The rest of the cuticles and cuticular structures associated with the eurypterid remains, are equivocal and difficult for confident assignment. They may well belong either to eury-pterids, scorpions or even other arthropod groups. They con-sist of different, more or less folded cuticle remains with or without openings and characteristic wrinkles (Fig. 9G), and setae detached from the cuticle surface (Fig. 9E), as well as long, stiff conical structures pointed distally (Fig. 9A). Such setae and conical structures have already been described and illustrated by Taugourdeau (1967) and recently by Filipiak and Zatoń (2011). These structures could well be either of eurypterid, scorpion or even different arthropod origin. The stiff spiny structure with sharply pointed tip and wide base (Fig. 9I), for example, is somewhat similar to some scorpion claws (e.g., Bartram et al. 1987), but again, a larger diagnos-tic cuticle fragment attached would be better for more certain assignment.

Cuticles of uncertain affinity

Some of our cuticles are characterised by reticulate, polygo-nal-like pattern and smooth surface lacking stomata (Fig. 8D–G). In this respect, they are very similar to the plant cu-ticles classified as Nematothallus (Pratt et al. 1978; Edwards 1982; see also Filipiak and Zatoń 2011). It is possi-ble, that the Nematothallus cuticles could represent the re-mains of early liverworts (Graham et al. 2004). However, the similarity of the cuticles investigated here to Nemato-thallus seems to be superficial. The cuticles discussed are stiffer, and have much smaller polygonal, cell-like fields and tiny flanges, well-visible on the cuticle margins (Fig. 8F, G). In most cases, they are delicate, from 2 to 2.5 µm high but sometimes they are completely reduced forming only the flat pattern on the surface. However, the thickness and projection of flanges are uniform in each individual sheet. A regular reticulum with more or less isodiametric, angular units are 3 × 4.5 ìm in size, so they are twice as small as in typical Nematothallus taxa sensu Edwards (1982; see Fig. 8B, C). Therefore, the systematic position of these cuticle remains is uncertain.

Microfacies of calcareous layers

In the Ivanye Horizon to Ustechko Member transition at Ivanye Zolote, calcareous interbeddings within the mixed carbonate-siliciclastic succession embrace two distinct micro-facies types, extremely differing in fossil frequency. The most characteristic are thin (mostly less than 10 cm) coqui-nas, corresponding to bivalve-ostracod packstone to grain-stone (Fig. 10). The frequently sorted shell accumulations show typically a densely-packed biofabric, in places clus-tered (nesting to stacking sensu Kidwell et al. 1986) or cha-otic. These skeletal concentrations rarely display an ero-sional contact with underlying mudrocks and graded bed-dingin, and comprise mostly concordantly oriented, con-vex-upward millimetre-sized disarticulated shells and frag-mented, non-micritized valves; larger fossils (above 1 cm) occur only in some debris layers. Silty/sandy and/or peloidal partings are common, paired with plane parallel (rarely, oblique and/or graded) laminations in some layers. Among other skeletal constituents, diverse ichthyolites are most nu-merous, accompanied by orthocone nautiloids and brachio pods (articulates and lingulids), as well as subordinate gas-tropods, tentaculitids (including putative “vermiform” micro-conchids), chaetetid sponges and fragmented probable grapto-lites. In addition, nautiloids and in situ lingulids are abundant e.g., in time-equivalent beds at Zalishchyky.

Fig. 10.

Lower Devonian bivalve-ostracod bioclastic limestone microfacies of the uppermost Ivanye Horizon, Ivanye Zolote locality (see Fig. 3 for the sam-ple location; compare coeval microfacies details from Ustechko in Uchman et al. 2004: fig. 4). Variable but mostly micrite-dominated peloidal-sandy ma-trix, and variously packed (stacking in some places) skeletal concentrations of originally aragonitic bivalve valves (as moulds) and largely disarticulated calcitic ostracod shells are most numerous. Note a distinctive graded bedding (normal in the lower part and reversed in the upper half) and plane lamination (A, sample I3; close-ups of coquina partings in A2–A4), frequent shelter cavities and geopetal infillings (within gastropod shell, B; sample K15), as well as iron oxide impregnation of the shelly material (largely ostracods) and ferruginized pressure-solution seam (B), and dolomitized internal sediment (dl in D; sample I2). Associated skeletal components include diverse ichthyoliths (Ic, arrowed in C; sample I0), locally abundant small-sized and smooth articulate brachiopods (Br, arrowed in A, note different preservation of brachiopod and bivalve shells in A4) and orthocone nautiloids (Or, note a broken wall cham-ber, arrowed in D), as well as chaetetid demosponge colonies (cf. Gritsenko et al. 1999; Ch in B2 and C2, rfc, radial-fibrous cement), “vermiform” microconchids (Mi in A3), phosphatic lingulid shells (Li in A2), and conical ribbed tentaculitids (Te in C2).

f10_863.jpg

Calcareous-sandy layers, characterized by variable thicknesses (up to 15 cm), occur in the topmost Ivanye Horizon, and a discontinuous level is found also in the bottom part of red clayey Ustechko Member. Mostly extremely impover-ished fossil remains, limited to ichthyolites and poorly-pre-served shelly, largely ostracod faunas, occur in the micrite-or sparry-sandy, frequently laminated matrix (Fig. 11).

Fig. 11.

Lower Devonian sparry-sandy, locally ferruginous microfacies of the topmost Ivanye Horizon (B; sample O7) and basal Ustechko Member (A; sample O1), Ivanye Zolote locality (see Fig. 3). Note scattered inter-laminated pelitic-sandy intraclasts (A), and a single recrystalized pelecypod valves (arrowed) in the faintly laminated packed ostracod microcoquina (B1; rectangular magnified in B2).

f11_863.jpg

Palaeoenvironment and paleoecology

Investigated samples from Ivanye Zolote and Ustechko were taken from the Early Devonian marginal marine sequences consisting of carbonates intercalated with siliciclastics. Inor-ganic geochemical proxies from the correlative uppermost Ivanye Beds at adjacent Zalishchyky section (see above) re-veal an overall environmental characteristics close to the re-gional background (Racki et al. 2012: fig. 8), and suggest mostly progressively clay-dominated, lower-productivity, and well-oxygenated sedimentary conditions up the succession. In addition, a distinctive enrichment trend in light carbon and ox-ygen isotopes in this locality is explained by a hydrochemical peculiarity and/or early meteoritic diagenetic overprint in an episodically restricted epeiric sea (Małkowski et al. 2009).

The highest calcareous layers in the Podolian succession well illustrate a consequent paleoenvironmental shallowing-upward evolution of the shrinking marine basin, forced by an eustatic sea-level fall (e.g., Walliser 1996: fig. 3), manifested in a recurrent blooming of low-diversity opportunistic shelly benthos only. Progressive fluctuating brackish or even fresh-water conditions, suitable for the fish fauna thriving (all major agnathan and gnathostome groups; Voichyshyn 2011: table 1; Voichyshyn and Szaniawski 2012)may be assumed (see sum-mary in Flugel 2004: 618–619), as well as their link with grad-ual development of the Old Red-type, coastal lagoon to flu-vial-estuarine habitats (Uchman et al. 2004). The rock-form-ing assemblage includes the nuculanid bivalve Palaeoneilo tschortkovensis and more diverse ostracods (Leperditia tyraica and several species of Welleriella, among others; see full faunal lists in Nikiforova et al. 1972: 247–250). In fact, re-markable leperditicopid microcoquinas probably record large populations of detritus-feeding euryhaline arthropods on mi-crobial and/or algal mats developed in tidal mudflats and supratidal marshes, within semi-restricted lagoons, bays or estuarian complexes (Vannier et al. 2001).

Such noteworthy sessile benthic species as the terebratulid brachiopod Mutationella podolica (also athyridid Protathyris) and chaetetid demosponge Tiverina vermiculata, as well actinocerid nautiloid Ormoceras dobrovljanensis, and Tenta-culites ornatus were listed by Nikiforova et al. (1972) and Gritsenko et al. (1999; their M. podolica and T. vermiculata communities, as updated by Mike Foote in the Paleobiology Database). The most common bivalve Palaeoneilo represents mobile infaunal deposit feeders (see Gritsenko et al. 1999), whilst M. podolica is well known in the low-diversity, high-dominance suspension-feeder biotas in extremely shallow-shelf habitats (“intertidal” Benthic Assemblages, BA 1–2 of Boucot 1975; compare Kozłowski 1929: 11–14). This en-demic species was probably also successful in unstable salin-ity conditions (as several other Middle Paleozoic “schizo-haline” terebratulids; Racki 1988) because it is reported even from the highest calcareous layers in the succession as the only macrofaunal element (Nikiforowa et al. 1972; see the Rhenish biofacies pattern in Boucot 1975: 215–216). In addition, also Tiverina vermiculata is seen as a unique colonizer of Siberian hypersaline basins (Dubatolov and Krasnov 1997), and simi-lar euryhaline preferences are postulated for tentaculitoid microconchids (= “vermiform gastropods” of Uchman et al. 2004; see Zatoń and Vinn 2011). Gritsenko et al. (1999: 481) suggest “transition from BA 2, for medium diversity community, through BA 1 for themonospecific unit, to the nonmarine or estuarine vertebrate community”.

Nautiloids exemplified the most frequent open marine mobile macrofaunal dwellers, but probably redeposited into the nearshore muddy lagoon due to episodic, both simple and complex storm actions. The recurrent well-agitated condi-tions are mostly extensively recorded in the bioclast rework-ing of bivalve shelly banks near carbonate/siliciclastic shoals and barriers, whereas bioturbation was generally minor. Sim-ilar upward shift from marginal-marine to fluvial facies was described from the Ustechko succession by Uchman et al. (2004).

Generally, amongst the palynofloral remains, those of land-origin predominate. Spore assemblages are taxonomi-cally moderately diverse comprising ca. 40%–80% of the rel-ative abundance. The other component, phytoplankton, com-prises the remaining ca. 20% but sometimes reaches 60% (Fig. 6). Besides palynomorphs, large-sized cuticles and plant tracheids together with organic sheets of Nematothallus and Cosmochlaina are present, as well. Moreover, some ar-thropod remains are also present in the material investigated.

The constant presence of acritarchs in the all samples in-vestigated points to marine conditions during sedimentation (e.g., Batten 1996). It is worth to notice the decreasing ten-dency in taxonomic diversity of acritarchs in the topmost samples what is characteristic for nearshore environments (Dorning 1981). Also interesting is the proportion between the microflora of land-origin (spores and cryptospores) ver-sus phytoplankton (represented mainly by acritarchs), which shows distinct fluctuations (Fig. 6). It can be explained as a result of the sea level changes and/or the presence of some factors influencing macroflora development on a nearby land. Three periods of domination of the land-derived parti-cles (IZ-1, IZ-4, and IZ-7), separated by three periods with phytoplankton increase (IZ-2, IZ-5, and IZ-8) can be distin-guished. Interesting is also the constant chitinozoan decrease with simultaneous leiosphaeres increase (Fig. 6). The pres-ence of leiosphaeres is explained as a result of brackish sur-face water conditions (Tyson 1993). Thus, changes of marine chemistry to more brackish, as noted above, could also be re-sponsible for the decrease of a relative abundance of chitino-zoans (Wrona 2009) and an impoverishment of acritarch as-semblage at the same time. Symptomatic is also a small dom-inance of cryptospores over trilete spore taxa (Fig. 6). Ac-cording to Steemans et al. (2007) crytospores were environ-mentally more restricted to damp land habitats comparing to trilete spores (see also Wellman et al. 2000).

Generally, the palynofacies described above is character-istic of nearshore environments. In such sedimentary condi-tions the land-derived organic particles are deposited fre-quently (e.g., Batten 1996). The presence of large-sized plant tracheids (Laevitubulus and Porcatitubulus), cuticles of enigmatic Nematothallus and Cosmochlaina, and abundant miospores and arthropod remains confirm such an interpreta-tion (e.g., Tyson 1993; Batten 1996).

Moreover, large number of phytoclasts (e.g., Nemato-thallus, Cosmochlaina, and banded tubes) may suggest the presence of sufficient vegetation on the Early Devonian Ukrainian land, which was a source of perspective food and a temporary shelter for the semi-aquatic eurypterids and maybe even other terrestrial arthropods (see also discussion in Filipiak and Zatoń 2011). It is also obvious, that the Early Devonian macroflora were, to a great extent, spore-produc-ing plants, strongly restricted to moist environments.

Palynological results from the Podolian sections are also consistent with sedimentological factors and comparable with those observed in the neighbouring Silurian–Devonian boundary section in the Barrandian area, Czech Republic (Fatka et al. 2003; Brocke et al. 2006). Moreover, Podolian occurrence of the eurypterid fauna is in accordance with sim-ilar purely marine eurypterid faunas known from Scotland, America, Africa, and Europe, where they occur together with other marine biota and well document their marine environ-mental conditions (e.g., Kjellesvig-Waering 1961; Caster and Kjellesvig-Waering 1964; Křiž et al. 1986).

Conclusions

Palynological investigation indicates the existence of abun-dant, well-preservedmicroflora assemblages in the mixed car-bonate-siliciclastic Lower Devonian deposits from Podolia, consisting mainly of miospore and phytoplankton taxa. Based on the appearance of characteristic miospores, this assemblage is not older than the NM Oppel Miospore Zone, strictly the Si Lineage Zone (upper Lochkovian) and tentatively corre-sponds to the Latericriodus woschmidti/L. postwoschmidtiAncyrodelloides delta conodont zones.

The constant presence of acritarch taxa in all samples in-vestigated indicates marine conditions during sedimentation. However, the decreasing tendency in taxonomic diversity of acritarchs in the topmost samples, together with simulta-neous disappearance of chitinozoans and increase in leio-sphere frequency may indicate a change of environmental conditions from marine toward more brackish ones at the top of IZ section.

Microfacies evolution of stratigraphically highest calcare-ous layers also well demonstrates progressive shallowing-up-ward transition from the marginal marine basin to brackish habitats, manifested in recurrent thriving of impoverished, mostly opportunistic and euryhaline benthos and diverse ich-thyofauna only. Effective storm and current reworking of bi-valve-dominated shelly banks is well recorded in the bioclastic accumulations, widely distributed in the shallowing mud-rich lagoonal environments (compare Uchman et al. 2004).

The association of plant and arthropod cuticles point to the presence of sufficient vegetation on the nearby land, where semi-aquatic eurypterids and other terrestrial arthro-pods could have found food and temporary shelter in that moist environment.

Acknowledgements

Geoffrey Playford (University of Queensland, Brisbane, Australia), Reed Wicander (Central Michigan University, Mount Pleasant, USA), and Philippe Steemans (University of Liège, Belgium) are thanked for the taxonomic consultation concerning microflora taxa. We are deeply grateful to El¿bieta Turnau (Polish Academy of Science, Cracow, Po-land) for her valuable insight into the first version of this manuscript. We warmly thank Daniel Drygant (State Museum of Natural History, L'viv, Ukraine) for introducing us into the field at Podolia. Geoffrey Playford, Claudia Rubinstein (Unidad de Paleopalinologia, CONICET IANIGLA, Mendoza, Argentina) and an anonymous referee are ac-knowledged for valuable remarks and constructive comments. Kyle Freeman (Institute of Paleobiology, Warsaw, Poland) is acknowledged for linguistic improvement of the final version of the text. The research was supported by a grant (No. N N307 057834) from the Ministry of Science and Higher Education to Hubert Szaniawski (Institute of Paleo-biology, Warsaw, Poland). This is a contribution related with the UNESCO/IGCP projects no 596 on “Climate change and biodiversity patterns inMid Paleozoic (Early Devonian to Early Carboniferous)” and no 591 on “The Early to Middle Paleozoic Revolution”.

References

1.

A.F. Abushik , A.Y. Berger , T.N. Koren' , T.L. Modzelevskaya , O.I. Nikifo-rova , and N.N. Predtechensky 1985. The fourth series of the Silu-rian System in Podolia. Lethaia 18: 125–146. Google Scholar

2.

A.D. Arkhangelskaya 1980. Plant spores from some Lower Devonian sec-tions of western regions of the Russian Platform [in Russian]. In : T. Byvscheva (ed.), Palinologičeskie issledovania i fanerozoa neftegazo-nostnyh regionov SSSR. Trudy Vsesoûznogo Naučno-Issledovatel'-skogo Geologičeskogo Neftianogo Instituta, Hama Branch, Moscow 217: 26–46. Google Scholar

3.

K.M. Bartram , A.J. Jeram , and P.A. Selden 1987. Arthropod cuticles in coal. Journal of the Geological Society, London 144: 513–517. Google Scholar

4.

D.J. Batten 1996. Palynofacies and palaeoenvironmental interpretation. In : J. Jansonius and D.C. McGregor (eds.), Palynology: Principles and Applications 3 , 1011–1064. American Association of Stratigraphic Palynologists Foundation, Salt Lake City, Utah. Google Scholar

5.

R.T. Becker , F.M. Gradstein , and O. Hammer 2012. The Devonian period. In : F.M. Gradstein , J.G. Ogg , M. Schmitz , and G. Ogg , (eds.), The Geoogic Time Scale 2012 , 559–601. Elsevier, Amsterdam. Google Scholar

6.

A.J. Boucot 1975. Evolution and Extinction Rate Controls. 427 pp. Elsevier, Amsterdam. Google Scholar

7.

P. Breuer 2007. Devonian Miospore Palynology in Western Gondwana: An Application to Oil Exploration. Vol. III: Taxonomy , 1–473. Unpub-lished Ph.D. thesis, Liege University, Liege. Google Scholar

8.

R. Brocke , O. Fatka , and V. Wilde 2006. Acritarchs and prasinophytes of the Silurian—Devonian GSSP (Klonok, Barrandian area, Czech Repub-lic). Bulletin of Geosciences 81: 27–41. Google Scholar

9.

K.E. Caster and E. Kjellesvig-Waering 1964. Upper Ordovician eury-pterids of Ohio. Palaeontographica Americana IV 32: 301–359. Google Scholar

10.

I. Chlupač and J. Hladil 2000. The global section and point of the Silu-rian—Devonian boundary. Courier Forschungs institut Senckenberg 225: 1–8. Google Scholar

11.

I. Chlupač , P. Lukeš , F. Paris , and H.P. Schonlaub 1985. The Loch-kovian—Pragian Boundary in the Lower Devonian of the Barrandian Area (Czechoslovakia). Jahrbuch der Geologischen Bundesanstalt 128: 9–41. Wien. Google Scholar

12.

J.M. Clarke and R. Ruedemann 1912. The Eurypterida of New York. New York State Museum 14: 628. Google Scholar

13.

K. Dorning 1981. Silurian acritarch distribution in the Ludlovian shelf sea of South Wales and the Welsh Borderland. In : J.W. Neale and M.D. Brasier (eds.), Microfossils from Recent and Fossil Shelf Seas , 31–36. Ellis Horwood, Chichester. Google Scholar

14.

D.M. Drygant 2010. Devonian Conodonts from South-West Margin of the East European Platform (Volyn'-Podolian Ukraine) [in Ukrainian]. 156 pp. Academperiodyka, Kyiv. Google Scholar

15.

D.M. Drygant and H. Szaniawski 2012. Lochkovian conodonts from Podolia, Ukraine and their stratigraphic significance. Acta Palaeonto-logica Polonica 57 (4): 833–861. Google Scholar

16.

V.N. Dubatolov and V.I. Krasnov 1997. Landscapes of Early Devonian seas in Siberia. Stratigraphy and Geological Correlation 7: 294–306. Google Scholar

17.

D. Edwards 1982. Fragmentary non-vascular plant microfossils from the Late Silurian of Wales. Botanical Journal of the Lineaus Society 84: 223–256. Google Scholar

18.

O. Fatka , R. Brocke , and V. Wilde 2003. Organic-walled microfossils at the Silurian/Devonian boundary stratotype (Klonk near Suchomasty, Barrandian area, Czech Republic). INSUGEO, Serie Correlación Geo-lógica 18: 125–128. Google Scholar

19.

P. Filipiak 2002. Palynofacies around the Frasnian/Famennian boundary in the Holy Cross Mountains, southern Poland. Palaeogeography, Palaeo-climatology, Palaeoecology 181: 313–324. Google Scholar

20.

P. Filipiak 2011. Palynology of the Lower and Middle Devonian deposits in southern and central Poland. Review of Palaeobotany and Palynology 166: 213–252. Google Scholar

21.

P. Filipiak and M. Zatoń 2011. Plant and animal cuticle remains from the Lower Devonian of southern Poland and their palaeoenvironmental sig-nificance. Lethaia 44: 397–409. Google Scholar

22.

E. Flugel 2004. Microfacies of Carbonate Rocks. Analysis, Interpretation and Application . 976 pp. Springer, Berlin. Google Scholar

23.

P. Gensel , N.G. Johnson , and P. Strother 1990. Early land plant debris (Hooker's “Waifs and Strays”?). Palaios 5: 520–547. Google Scholar

24.

L.E. Graham , L.W. Wilcox , M.E. Cook , and P.G. Gensel 2004. Resistant tissues of modern marchantioid liverworts resemble enigmatic Early Paleozoic microfossils. Proceedings of the National Academy of Sci-ences of the United States of America 101: 11025–11029. Google Scholar

25.

V.P. Gritsenko , A.A. Istchenko , L.I. Konstantinenko , and P.D. Tsegelnjuk 1999. Animal and plant communities of Podolia. In : A.J. Boucot and J.D. Lawson (eds.), Paleocommunities—A Case Study from the Si-lurian and Lower Devonian , 462–487. Cambridge University Press, Cambridge;  Google Scholar

26.

M.R. House and F.M. Gradstein 2004. The Devonian Period. In : J. Gradstein , A. Ogg , and A. Smith (eds.), Geologic Time Scale , 202–221. Cambridge University Press, Cambridge . Google Scholar

27.

A.J. Jeram 1994. Carboniferous Orthrosterni and their relationship to living scorpions. Palaeontology 37: 513–550. Google Scholar

28.

S.M. Kidwell , F.T. Fursich , and T. Aigner 1986. Conceptual framework for the analysis and classification of fossil concentrations. Palaios 1: 228–238. Google Scholar

29.

V.V. Kirjanov [Kiranov, V.V.] 1978. Akritarhi silura Volyno-Podoli. 115 pp. Naukova Dumka, Kijev. Google Scholar

30.

E. Kjellesvig-Waering 1961. The Silurian Eurypterida f the Welsh Border-land. Journal of Paleontology 35: 789–835. Google Scholar

31.

R. Kozłowski 1929. Les Brachiopodes gothlandiens de la Podolie polo-naise. Palaeontologia Polonica 1: 1–254. Google Scholar

32.

W. Krzemiński , E. Krzemińska , and D. Wojciechowski 2010. Silurian synziphosurine horseshoe crab Pasternakevia revisited. Acta Palae-ontologica Polonica 55: 133–139. Google Scholar

33.

J. Křiž , H. Jaeger , F. Paris , and H.P. Schonlaub 1986. Přidoli—the fourth subdivision of the Silurian. Jahrbuch der Geologischen Bundesanstalt 129: 291–360. Wien. Google Scholar

34.

A. Le Herrise , R. Gourvennec , and R. Wicander 1997. Biogeography of Late Silurian and Devonian acritarchs and prasinophytes. Review Palaeo-botany and Palynology 98: 105–124. Google Scholar

35.

A. Le Herisse , K.J. Dorning , G.L. Mullins , and R. Wicander 2009. Global patterns of organic-walled phytoplankton biodiversity during the late Silurian to earliest Devonian. Palaeontology 33: 25–75. Google Scholar

36.

K. Małkowski , G. Racki , D. Drygant , and H. Szaniawski 2009. Carbon isotope stratigraphy across the Silurian—Devonian transition in Podolia, Ukraine: evidence for a global biogeochemical perturbation. Geologi-cal Magazine 146: 674–689. Google Scholar

37.

P.L. Manning and J.A. Dunlop 1995. The respiratory organs of eurypterids. Palaeontology 38: 287–297. Google Scholar

38.

O.I. Nikiforova , N.N. Predtechensky [Predtečensky, N.N.], A.F. Abushik [Abušik, A.F.], M.M. Ignatovich [Ignatovič, M.M.], T.L. Modzalevskaya [Modzalevskaa, T.L.], A.Y. Berger [Berger, A.Û.], L.S. Novoselova , and Y.K. Burkov [Burkov, Û.K.] 1972. Opornyj razrez silura i nižnego devona Podolii. 262 pp. Nauka, Leningrad. Google Scholar

39.

E. Olempska 2012. Exceptional soft-tissue preservation in boring cteno-stome bryozoans and associated “fungal” borings from the Early Devo-nian of Podolia, Ukraine. Acta Palaeontologica Polonica 57: 925–940. Google Scholar

40.

E. Olempska , D. J. Horne , and H. Szaniawski 2012. First record of preserved soft parts in a Palaeozoic podocopid (Metacopina) ostracod, Cytherel-lina submagna: phylogenetic implications. Proceedings of the Royal Society B 279: 564–570. Google Scholar

41.

Paleobiology Database 2012. Accessed on 10.06.2012.  http://paleodb.org Google Scholar

42.

F. Paris and Y. Grahn 1996. Chitinozoan of the Silurian—Devonian bound-ary sections in Podolia, Ukraine. Palaeontology 39: 629–649. Google Scholar

43.

F. Paris , S. Laufeld , and I. Chlupač 1981. Chitinozoa of the Silurian—De-vonian boundary stratotypes in Bohemia. Sveriges Geologiska Under-sökning, Ser. Ca 51: 1–29. Google Scholar

44.

F. Paris , T. Winchester-Seeto , K. Boumendjel , and Y. Grahn 2000. Toward a global biozonation of Devonian chitinozoans. Courier Forschungs-institut Senckenberg 220: 39–55. Google Scholar

45.

L.M. Pratt , T.L. Phillips , and J.M. Dennison 1978. Evidence of non-vascular land plants from the early Silurian (Llandoverian) of Virginia, USA. Review of Palaeobotany and Palynology 25: 121–149. Google Scholar

46.

G. Racki 1988. Brachiopod ecology of the Devonian carbonate complex and problem of brachiopod hyposalinity. In : P.R. Rachebouf and C.C. Emig (eds.), Les Brachiopodes fossiles et actuels. Biostratigraphie du Paléozoique 4: 363–373. Google Scholar

47.

G. Racki , A. Baliński , R. Wrona , K. Małkowski , D. Drygant , and H. Szaniawski 2012. Faunal dynamics across the Silurian—Devonian positive isotope excursion (β13C, β18O) in Podolia, Ukraine: Compara-tive analysis of the Ireviken and Klonk events. Acta Palaeontologica Polonica 57: 795–832. Google Scholar

48.

J.B. Richardson and D.C. McGregor 1986. Silurian and Devonian spore zones of the Old Red Sandstone Continent and adjacent regions. Bulle-tin of Geological Survey of Canada 364: 1–79. Google Scholar

49.

J.B. Richardson , M.R. Syed , and T. Al-Meri 1981. Acritarchs, miospores and Correlation of the Ludlovian—Dawntonian and Sylurian—Devonian Boundaries. Review Palaeobotany and Palynology 34: 209–224. Google Scholar

50.

C. Rubinstein and P. Steemans 2002. Miospore assemblages from the Silu-rian—Devonian boundary, in borehole A1-61, Ghadamis Basin, Libya. Review Palaeobotany and Palynology 118: 397–421. Google Scholar

51.

P. Steemans 1989. Etude palynostratigraphique du Devonien inferieur dans l'Ouest de l'Europe. Mémoires pour servir à l'Explication des Cartes Géologiques et Minières de la Belgique, Mémoire 27: 1–453. Google Scholar

52.

P. Steemans , C.H. Wellman , and J. Filatoff 2007. Palaeophytogeogra-phical and palaeoecological implications of a miospore assemblage of earliest Devonian (Lochkovian) age from Saudi Arabia. Palaeogeo-graphy, Palaeoclimatology, Palaeoecology 250: 237–254. Google Scholar

53.

M. Streel , K. Higgs , S. Loboziak , W. Riegel , and P. Steemans 1987. Spore stratigraphy and correlation with faunas and floras in the type ma-rine Devonian of the Ardenne-Rhenish Regions. Review Palaeobotany and Palynology 50: 211–229. Google Scholar

54.

P. Taugourdeau 1967. Debris microscopiques d'eurypterides du Paleo-zoïque Saharien. Revue de Micropaléontologie 10: 119–127. Google Scholar

55.

V.P. Tollerton Jr. 1989. Morphology, taxonomy, and classification of the or-derEurypteridaBurmeister, 1843. Journal of Paleontology 63: 642–657. Google Scholar

56.

E. Turnau 1986. Lower to Middle Devonian spores from vicinity of Pionki (central Poland), Review of Palaeobotany and Palynology 46: 311–354. Google Scholar

57.

R.V. Tyson 1993. Palynofacies analysis. In : D.G. Jenkins (ed.), Applied Micropaleontology 153–191. Kluwer Academic Publishers, Dordrecht.  Google Scholar

58.

A. Uchman , D. Drygant , M. Paszkowski , J.S. Porębski , and E. Turnau 2004. Early Devonian trace fossils in non-marine redbeds in Podolia, Ukraine: palaeoenvironmental implications. Palaeogeography, Palaeo-climatology, Palaeoecology 214: 67–83. Google Scholar

59.

J. Vannier , S.Q. Wang , and M. Coen 2001. Leperditicopid arthropods (Ordo-vician—Late Devonian): functional morphology and ecological range. Journal of Paleontology 75: 75–95. Google Scholar

60.

V. Voichyshyn 2011. The Early Devonian armoured agnathans of Podolia, Ukraine. Palaeontologia Polonica 65: 1–211. Google Scholar

61.

V. Voichyshyn and H. Szaniawski 2012. Acanthodian jaw bones from Lower Devonian marine deposits of Podolia, Ukraine. Acta Palaeonto-logica Polonica 57: 879–896. Google Scholar

62.

O.H. Walliser 1996. Global events in the Devonian and Carboniferous. In : O.H. Walliser (ed.), Global Events and Event Stratigraphy in the Phanerozoic , 225–250. Springer-Verlag, Berlin. Google Scholar

63.

C.H. Wellman 1995. “Phytodebris” from Scottish Silurian and Lower De-vonian continental deposits. Review of Palaeobotany and Palynology 84: 255–279. Google Scholar

64.

C.H. Wellman , K. Habgood , G. Jenkins , and J.B. Richardson 2000. A new assemblage (microfossil and megafossil) from the Lower Old Red Sand-stone of Anglo-Welsh Basin; its implications for the palaeoecology of early terrestrial ecosystem. Review of Palaeobotany and Palynology 109: 161–196. Google Scholar

65.

R. Wicander and G.D. Wood 1997. The use of microphytoplankton and chitinozoans for interpreting transgressive/regressive cycles in the Rapid Member of theCedar Valley Formation (MiddleDevonian), Iowa. Review of Palaeobotany and Palynology 98: 125–152. Google Scholar

66.

L.J. Wills 1959. The external anatomy of some Carboniferous ‘scorpions’. Part I. Palaeontology 1: 261–282. Google Scholar

67.

G.D. Wood , A.M. Gabriel , and J.C. Lawson 1996. Palynological tech-niques—processing and microscopy. In : J. Jansonius and D.C. McGregor (eds.), Palynology: Principles and Applications 1 , 29–50. American As-sociation of Stratigraphic Palynologists Foundation, Salt Lake City,Utah. Google Scholar

68.

R. Wrona 1980. Upper Silurian—Lower Devonian Chitinozoa from subsurface of southeastern Poland. Palaeontologia Polonica 41: 103–165. Google Scholar

69.

R. Wrona 2009. Chitinozoan palaeoecological dynamics across the Silu-rian—Devonian transition in the Dnister Basin (Podolia, Ukraine). In : D. Peryt and M.A. Kaminski (eds.), Seventh Micropalaeontological Workshop, MIKRO-2009 (Święta Katarzyna, Poland, September 28– 30, 2009), Abstracts and Excursion Guide. Grzybowski Foundation Special Publication 15: 82–83. Google Scholar

70.

M. Zatoń and O. Vinn 2011. Microconchids. Geology Today 27: 236–239. Google Scholar
© 2012 P. Filipiak et al. This is an open-access article distributed under the terms of the Creative Commons At-tribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original au-thor and source are credited.
Paweł Filipiak, Michał Zatoń, Hubert Szaniawski, Ryszard Wrona, and Grzegorz Racki "Palynology and Microfacies of Lower Devonian Mixed Carbonate-Siliciclastic Deposits in Podolia, Ukraine," Acta Palaeontologica Polonica 57(4), 863-877, (1 December 2012). https://doi.org/10.4202/app.2011.0184
Received: 29 November 2011; Accepted: 10 August 2012; Published: 1 December 2012
JOURNAL ARTICLE
15 PAGES


SHARE
ARTICLE IMPACT
Back to Top