BioOne.org will be down briefly for maintenance on 17 December 2024 between 18:00-22:00 Pacific Time US. We apologize for any inconvenience.
How to translate text using browser tools
1 January 2001 UPPER WENLOCK AND LOWER LUDLOW (SILURIAN), POST-EXTINCTION GRAPTOLITES, VŠERADICE SECTION, BARRANDIAN AREA, CZECH REPUBLIC
A. KOZŁOWSKA-DAWIDZIUK, A.C. LENZ, P. ŠTORCH
Author Affiliations +
Abstract

The Všeradice section was trenched and continuously sampled for graptolites from the base of the post-extinction upper Homerian strata to low in the Ludlow. The upper Homerian is divisible into three biozones, a lower parvusnassa Biozone, a middle praedeubelideubeli Biozone, and an upper ludensisgerhardi Biozone, the last named being succeeded by graptolites of the lowest Ludlow nilssoni Biozone. The graptolite diversity of nine species in the upper part of the parvusnassa Biozone is the highest in the world. Five monograptid species, Pristiograptus parvus Ulst, 1974, P. dubius (Suess, 1851), Colonograptus deubeli (Jaeger, 1959), Colonograptus gerhardi (Kühne, 1955), and Colonograptus praedeubeli (Jaeger, 1990) are described from the upper Homerian. Twelve species of retiolitids, Gothograptus nassa (Holm, 1890), Neogothograptus cf. balticus (Eisenack, 1951), Spinograptus spinosus (Wood, 1900), Spinograptus clathrospinosus (Eisenack, 1951), Spinograptus munchi (Eisenack, 1951), Spinograptus reticulolawsoni (Kozłowska-Dawidziuk, 1997) Spinograptus? cf. nevadensis (Berry and Murphy, 1975), Spinograptus? sp. A and Spinograptus? sp. B, Plectograptus macilentus (Törnquist, 1887), and Plectograptus? karlsteinensis new species and Plectograptus? ovatus new species, are described and illustrated from upper Homerian and lowest Ludlow strata. The two new species occur in the upper parvus–nassa and lowest praedeubeli–deubeli, and ludensisgerhardi biozones, respectively. Two morphs of Gothograptus nassa, a narrow (more typical) form, and a wide form, are recognized. While overlapping in their overall ranges, their occurrences in any particular small interval are sometimes mutually exclusive, suggesting ecological control.

A. KOZŁOWSKA-DAWIDZIUK, A.C. LENZ, and P. ŠTORCH "UPPER WENLOCK AND LOWER LUDLOW (SILURIAN), POST-EXTINCTION GRAPTOLITES, VŠERADICE SECTION, BARRANDIAN AREA, CZECH REPUBLIC," Journal of Paleontology 75(1), 147-164, (1 January 2001). https://doi.org/10.1666/0022-3360(2001)075<0147:UWALLS>2.0.CO;2
Accepted: 1 July 2000; Published: 1 January 2001
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top