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STRATIGRAPHY AND CORRELATION OF THE GRUND FORMATION IN THE MOLASSE BASIN, NORTHEASTERN AUSTRIA (MIDDLE MIOCENE, LOWER BADENIAN)

• Geologica Carpathica
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• Volume 55 No.2 / April 2004

Published: Apr 2004

Pages: 207 - 215

Authors: STJEPAN CORIC, MATHIAS HARZHAUSER, JOHANN HOHENEGGER, OLEG MANDIC, PETER PERVESLER, REINHARD ROETZEL, FRED ROGL, ROBERT SCHOLGER, SILVIA SPEZZAFERRI, KARL STINGL, LILIAN SVABENICKA, IRENE ZORN, MARTIN ZUSCHIN

Abstract: Mollusc bearing Neogene strata were collectively designated as ”Grund Beds” in the 19^th century. The different lithostratigraphic formations of these Grund Beds were studied in the Austrian Molasse Basin north of the Danube (Alpine-Carpathian Foredeep). Biostratigraphic methods and paleomagnetic measurements revealed that the entire Karpatian Laa Formation spans nannoplankton Zone NN4. It is transgressive on the Lower Miocene, Ottnangian marine sequences. The upper part of the Laa Formation correlates with the first occurrence of Globigerinoides bisphericus and is correlated in the type locality with the reverse Chron C5Cr and the normal chron C5Cn.2n. A distinct unconformity separates the Karpatian and Badenian sequences. The first Badenian transgression of the Molasse Basin resulted in a clastic sequence which, for the time being, has no lithostratigraphic designation. The lower part belongs to nannoplankton Zone NN4, with the first occurrence of Praeorbulina glomerosa glomerosa (Middle Miocene, Zone M5). The upper part of this basal clastic sequence belongs to nannoplankton Zone NN5. A coarse conglomerate, overlying a further unconformity, is interpreted as the transgression horizon of the fine clastic, more than 250 m thick Grund Formation. It spans nannoplankton Zone NN5 and contains Praeorbulina glomerosa circularis. Higher up in the sections, this species occurs together with Orbulina suturalis (plankton Zone M6). Ostracods and molluscs from the Grund Formation is distinctly different from the Karpatian, and indicate an unambiguously Badenian age. The normal paleomagnetic polarity measured in the type locality of the Grund Formation is interpreted as Chron C5Bn.2n. The Gaindorf Formation is coeval with the Grund Formation, developed along the western coast of the Molasse Basin. The more eastern development of the Mailberg Formation stratigraphically corresponds to the upper part of the Grund Formation with the co-occurrence of Po. glomerosa circularis and O. suturalis. In the Mailberg Formation a reverse magnetization is interpreted as correlating with Chron C5Bn.r.

Keywords: Miocene, Karpatian, Badenian, Austria, Alpine-Carpathian Foredeep, Grund Formation, stratigraphy

Volume 55 no. 2 / April 2004

• REINHARD ROETZEL, PETER PERVESLER

  STORM-INDUCED EVENT DEPOSITS IN THE TYPE AREA OF THE GRUND FORMATION (MIDDLE MIOCENE, LOWER BADENIAN) IN THE MOLASSE ZONE OF LOWER AUSTRIA

• PETER PERVESLER, ALFRED UCHMAN

  ICHNOFOSSILS FROM THE TYPE AREA OF THE GRUND FORMATION (MIOCENE, LOWER BADENIAN) IN NORTHERN LOWER AUSTRIA (MOLASSE BASIN)

• PETER PERVESLER, MARTIN ZUSCHIN

  A LUCINOID BIVALVE TRACE FOSSIL SARONICHNUS ABELI IGEN. ET ISP. NOV. FROM THE MIOCENE MOLASSE DEPOSITS OF LOWER AUSTRIA, AND ITS ENVIRONMENTAL SIGNIFICANCE

• MARTIN ZUSCHIN, MATHIAS HARZHAUSER, OLEG MANDIC

  TAPHONOMY AND PALEOECOLOGY OF THE LOWER BADENIAN (MIDDLE MIOCENE) MOLLUSCAN ASSEMBLAGES AT GRUND (LOWER AUSTRIA)

• OLEG MANDIC

  PECTINID BIVALVES FROM THE GRUND FORMATION (LOWER BADENIAN, MIDDLE MIOCENE, ALPINE-CARPATHIAN FOREDEEP) — TAXONOMIC REVISION AND STRATIGRAPHIC SIGNIFICANCE

• STJEPAN CORIC, LILIAN SVABENICKA

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

• SILVIA SPEZZAFERRI

  FORAMINIFERAL PALEOECOLOGY AND BIOSTRATIGRAPHY OF THE GRUND FORMATION (MOLASSE BASIN, LOWER AUSTRIA)

• STJEPAN CORIC, FRED ROGL

  ROGGENDORF-1 BOREHOLE, A KEY-SECTION FOR LOWER BADENIAN TRANSGRESSIONS AND THE STRATIGRAPHIC POSITION OF THE GRUND FORMATION (MOLASSE BASIN, LOWER AUSTRIA)

• IRENE ZORN

  OSTRACODA FROM THE LOWER BADENIAN (MIDDLE MIOCENE) GRUND FORMATION (MOLASSE BASIN, LOWER AUSTRIA)

• GUDRUN DAXNER-HOCK, PETRA M. MIKLAS-TEMPFER, URSULA B. GOHLICH, KATI HUTTUNEN, EMESE KAZAR, DORIS NAGEL, GERTRUD E. ROESSNER, ORTWIN SCHULTZ, REINHARD ZIEGLER

  MARINE AND TERRESTRIAL VERTEBRATES FROM THE MIDDLE MIOCENE OF GRUND (LOWER AUSTRIA)

• ROBERT SCHOLGER, KARL STINGL

  NEW PALEOMAGNETIC RESULTS FROM THE MIDDLE MIOCENE (KARPATIAN AND BADENIAN) IN NORTHERN AUSTRIA

• STJEPAN CORIC, MATHIAS HARZHAUSER, JOHANN HOHENEGGER, OLEG MANDIC, PETER PERVESLER, REINHARD ROETZEL, FRED ROGL, ROBERT SCHOLGER, SILVIA SPEZZAFERRI, KARL STINGL, LILIAN SVABENICKA, IRENE ZORN, MARTIN ZUSCHIN

  STRATIGRAPHY AND CORRELATION OF THE GRUND FORMATION IN THE MOLASSE BASIN, NORTHEASTERN AUSTRIA (MIDDLE MIOCENE, LOWER BADENIAN)