EXPERIMENTAL DECAY OF GILLS IN FRESHWATER BIVALVES AS A KEY TO UNDERSTANDING THEIR PRESERVATION IN UPPER TRIASSIC LACUSTRINE DEPOSITS

ALEKSANDRA SKAWINA

doi:10.2110/palo.2009.p09-081r

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ALEKSANDRA SKAWINA

Abstract

Freshwater bivalves with exceptionally well-preserved gill supports occur in the Upper Triassic (Carnian) mudrocks at the Krasiejów claypit in southern Poland. X-ray EDS (energy dispersion system) spectrometer analysis reveals that the originally chitinous gill supports are secondarily mineralized in calcium phosphate. Co-occurrence of mineralized bacteria suggests they were involved in the phosphatization process. Actualistic taphonomic experiments using the freshwater mussel Unio tumidus suggest that mineralization was completed between 50 to 150 hours after the death of the fossil bivalves.

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ALEKSANDRA SKAWINA "EXPERIMENTAL DECAY OF GILLS IN FRESHWATER BIVALVES AS A KEY TO UNDERSTANDING THEIR PRESERVATION IN UPPER TRIASSIC LACUSTRINE DEPOSITS," PALAIOS 25(3), 215-220, (1 March 2010). https://doi.org/10.2110/palo.2009.p09-081r

Accepted: 7 December 2009; Published: 1 March 2010

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