Taphonomy and significance of rare chalk (Late Cretaceous) echinoderms preserved as beach clasts, north Norfolk, UK

Autor:	S. K. Donovan
Rok vydání:	2012
Předmět:	Paleontology Temnocidaris Corrasion Taphonomy biology Clastic rock Bioerosion Geology biology.organism_classification Crinoid Echinocorys Cretaceous
Zdroj:	Proceedings of the Yorkshire Geological Society. 59:109-113
ISSN:	2041-4811 0044-0604
DOI:	10.1144/pygs2012-313
Popis:	Summary Fossil echinoderms derived from the Chalk occur rarely as clasts eroded from erratic rafts on the beaches of north Norfolk and are almost invariably represented by the holasteroid echinoid Echinocorys scutata (Leske). A small collection of other echinoderms from the Overstrand to Cromer coast includes the crinoid Austinocrinus bicoronatus (von Hagenow), and the echinoids Temnocidaris ( Stereocidaris ) sp., phymosomatid sp. and Galerites sp. Most preserve at least some evidence of corrasion and/or bioerosion. The echinoids are preserved either as steinkerns or are otherwise protected by flint; the crinoid columnal had lost much of its surface detail due to corrasion. The known stratigraphic ranges of these species suggest that they are derived from the local part of the Norfolk Chalk, spanning the upper Campanian to lower Maastrichtian interval.
Databáze:	OpenAIRE
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