Vyzkum ostnokozcu konepruskych vapencu Barrandienu (spodni devon, prag) - II

This article has complemented the first report (Prokop 2000), concerning the palaeontological and biostratigraphical research, carried out during the last seven years in the Lower Devonian reef complex near Koněprusy. The study has been based on a contract between the National Museum, Prague and the Management of the quarries 'Čertovy schody' (project MKOCEZ99F0201). In 2002, 12 crinoid taxa have been newly identified or verified in the Koněprusy Limestone (see following list). In addition, primary spines of echinoid Xenocidaris (formerly known only from the Middle and Upper Devonian, outside of the Czech Massive) were discovered in the organodetrital limestones that had deposited on the reef talus. Until the end of 2002, 71 taxa of echinoderms have been ascertained in the Koněprusy Lower Devonian reef komplex: Crinoidea (58), Rhombifera (1), Diploporita (1), Blastoidea (2), Asteroidea (1), Ophiuroidea (3), Ophiocistioidea (1), Holothuroidea (1) and Echinoidea (3). Most of the fossil remains were obtained by washing of the weathered parts of limestones or by examination of the weathered-out specimens on the surface of a limestone sliver. The essential paleoecological survey regarding the echinoderm assemblages that lived in the different parts of the Koněprusy reef is presented in following diagram: A: Typical assemblage of the reef core. B: species inhabiting both the reef core and reef talus. C: The asemblage inhabiting only the detritic bottom of the reef talus.