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Publisher © Czech Geological Survey, ISSN: 2336-5757 (online), 0514-8057 (print)

The shallow-tier bioturbate structures preserved in the Řevnice Quartzite (Upper Ordovician, Barrandian area, Czech Republic)

Radek Mikuláš

Geoscience Research Reports 46, 2013 (GRR for 2012), pages 189–191

Keywords: Ordovician, Trace fossils, Barrandian area, marine sediments, ichnofarbic

Map sheets: Zdice (12-32)

Full text (PDF, 0.36 MB)

Abstract

Helminthopsis ichnofabric was discovered as the uppermost tier in the Řevnice Quartzite (Libeň Formation; Upper Ordovician of the Barrandian area). It is in contradiction with the prevailing interpretation of the unit as the typical Skolithos ichnofacies. Instead, the facies was probably characterized not by shifting substrates but by episodic sedimentation, alternating by time periods of medium to low energy of currents and waving.