Biostratigraphy of the Lower Cretaceous limestones of the Godula facies of the Silesian Unit, Outer Western Carpathians

 

Authors: Boorová D, Skupien P, Vašíček Z

Published in: Bulletin of Geosciences, volume 79, issue 2; pages: 121 - 131; Received 8 February 2003; Accepted in revised form 23 July 2003;

Keywords: Outer Western Carpathians, Silesian Unit, Těšín Limestone, Lower Cretaceous, microfacies, calpionellids, dinoflagellates, biostratigraphy,

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Abstract

Microfacies and microfossils were studied in the isolated bodies of detritic limestone outcrops in the western part of the Silesian Unit near the town of Měrkovice. The total limestone thickness reaches up to ten metres. Fossil remnants observed in thin sections give clear evidence of a reef to sublittoral shallow-sea source area for these deposits, which the present authors believe to be the Baška ridge. Assemblages of calpionellids of the Middle Berriasian (representing the standard Calpionella Biozone, and the Elliptica and Longa Subzones) were identified in the fine-grained limestones. Transitional deposits between the limestones and the overlying dark grey pelitic flysch sediments yielded noncalcareous dinoflagellates of the Late Berriasian and lower Early Valanginian age.