International Geological Journal - Official Journal of the Carpathian-Balkan Geological Association

LOWER CRETACEOUS AMMONITE AND DINOCYST BIOSTRATIGRAPHY AND PALEOENVIRONMENT OF THE SILESIAN BASIN (OUTER WESTERN CARPATHIANS)

Pages: 179 - 189

Authors: PETR SKUPIEN, ZDENEK VASICEK

Abstract: The basinal, or Godula sequence of the Silesian Unit of the Outer Western Carpathians incorporated in the present nappe structure is characterized by a considerable thickness of Lower Cretaceous dark-grey, prevailingly pelitic deposits. Barremian and Lower Aptian ammonites occur in several isolated fossiliferous beds. Non-calcareous dinoflagellate associations were analysed in the same beds to provide a correlation of both ammonite and dinoflagellate ranges. Where index ammonites are missing, associations of dinocysts become a key stratigraphic element in thick lithologically monotonous deposits. The composition of dinocysts also supports environmental and paleoclimatic reconstructions in the area studied.

Keywords: Silesian Unit, Lower Cretaceous, Barremian-Aptian, dinoflagellate cysts, ammonites, paleoecology

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