Cretaceous sediments on the territory of the Džbán Nature Park – some interesting phenomena

Geoscience Research Reports 46, 2013 (GRR for 2012), pages 93–96

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Abstract

During the mapping of geohazards mainly landslides, on the territory of the Džbán Nature Park some interesting phenomena in the Cretaceous sediments, such as diagenetic cavities and biogenic structures, were recognized. The actual state of abandoned clay pits and stone quarries was documented as well. In the precretaceous relief the palaeovalleys up to 30 m deep were recorded, filled during Cenomanian sedimentation partly with material from Carboniferous subarkoses. According to the petrologic investigations so called opukas consist mainly of spiculitic, silicified marlstones passing into pure silicites.