Pyritized fossil fauna in the Motol Formation (Wenlock) in the Kosov Quarry near Beroun

 

Michal Mergl, Petr Budil

Geoscience Research Reports 44, 2011 (GRR for 2010), pages 103–108
Map sheets: Beroun (12-41)

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Abstract

The pyritized shelly fauna from the Motol Formation of the Kosov Quarry near Beroun is described. The fossils fauna consists mainly of brachiopods with dominant Leangella tuffogena associated with genera Eoplectodonta, Arcualla, Resserella, Ravozetina, Orhoria, Skenidioides and others, while trilobites are represented by genera Cheirurus, Staurocephalus, Cyphoproetus, Aulacopleura, Otarionl and Leonaspisl. Small rugose and tabulate corals are abundant. The composition of the association is similar to the late Wenlock Strophoprion - Eoplectodonta Community (sensu Havlíček - Štorch 1990) previously known only from tuffaceous limestone of the Svatý Jan volcanogenic centre area. The trilobite fauna belongs to the Liolalax - Sphaerexochus - Cheirurus trilobite association (sensu Chlupáč 1987). The fossil association is confined to thin layer of a muddy limestone bed inside the graptolite shale succession within the Cyrtograptus lundgreni Zone (Wenlock, late Sheinwoodian). The etching of limestone by weak acetic acid solution seems to be a good and promising method for study of small shells and exoskeletons.