Trilobite fauna of the Šárka Formation at Praha - Červený vrch Hill (Ordovician, Barrandian area, Czech Republic)


Authors: Budil P, Fatka O, Bruthansová J

Published in: Bulletin of Geosciences, volume 78, issue 2; pages: 113 - 117; Received 4 March 2003; Accepted in revised form 21 March 2003;

Keywords: Ordovician, Arthropoda, Trilobita, Naraoiidae, Barrandian,

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Shales of the Šárka Formation exposed in the excavation on Červený vrch Hill at Praha-Vokovice contain a common but monotonous assemblage of phyllocarids associated with other extremely rare arthropods. Almost all trilobite remains (genera Ectillaenus Salter, 1867, Placoparia Hawle et Corda, 1847 and Asaphidae indet.) occur in a single horizon of siliceous nodules of stratigraphically uncertain position, while the surprising occurrence of possible naraoid trilobite (Pseudonaraoia hammanni gen. n., sp. n.) comes from dark grey shales. The general character of the arthropod assemblage characterized by an expressive dominance of planktonic and/or epi-planktonic elements (phyllocarids) indicates a specific life environment (most probably due to poor oxygenation). This association corresponds to the assemblage preceding the Euorthisina-Placoparia Community sensu Havlíček and Vaněk (1990) in the lower portion of the Šárka Formation.