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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Abstract
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.