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

CALCAREOUS NANNOFOSSIL BIOSTRATIGRAPHY OF THE GRUND FORMATION (MOLASSE ZONE, LOWER AUSTRIA)

Pages: 147 - 153

Authors: STJEPAN CORIC, LILIAN SVABENICKA

Abstract: The calcareous nannoplankton was studied in samples from the Grund Formation type locality (sections B, F, G and H). Samples from Grund-Windmühlberg (W1–W4) were further collected and investigated. The nannofossil assemblages are characterized by biostratigraphically important Helicosphaera waltrans, H. walbersdorfensis and the rare occurrence of discoasterids. Although the marker species Sphenolithus heteromorphus is absent in all samples, the composition of nannofossils enables specification of these deposits as Biozone NN5 of Martini (Lower Badenian). Regular presence of H. waltrans, which is usually limited to a short stratigraphic interval within nannoplankton Zone NN5, enables attribution of these sediments to the Helicosphaera waltrans Horizon (Svabenicka 2002).

Keywords: Badenian, Austria, Molasse Basin, Grund Formation, calcareous nannofossils, NN5 Nannoplankton Zone

Download PDF document Show Text Version

Volume 55 no. 2 / April 2004

Volume 55 no. 2