Tidal sediments in the Upper Marine Molasse (OMM) of the Allgäu area (Lower Miocene, Southwest-Germany)
Authors: Frieling, Dorothea; Mazumder, Rajat; Reichenbacher, Bettina
Source: Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen, Volume 254, Numbers 1-2, October/November 2009 , pp. 151-163(13)
Publisher: E. Schweizerbart'sche Verlagsbuchhandlung
Abstract:
Evidence for tidal influences in the Upper Marine Molasse (OMM) of the Allgäu area (Southwest German part of the Molasse Basin) is presented. The studied sections in the "Ellhofer Tobel" ravine reveal an approximately 140 m thick succession of marine sediments. Four different facies types are distinguished in this succession: 1) a Glauconitic Sandstone Facies, 2) a Heterolithic Facies, 3) a Cross-Stratified Sandstone Facies and 4) a Conglomeratic Facies. These lithofacies represent different near coastal and shallow marine environments. A tidal influence is indicated by the presence of the Heterolithic Facies which contains associated epsilon cross-stratification and megaripples (or subaquatic dunes). A general current direction from south to north is consistent documented by subaquatic dune foresets and the orientation of ripple foresets. If the coastal environment near the southern coast of the Molasse Sea had a rather simple tidal current regime this dominant northerly current direction could be interpreted as ebb currents.Keywords: EARLY MIOCENE; MOLASSE BASIN; ALLGAU; UPPER MARINE MOLASSE (OMM); TIDAL SEDIMENTS
Document Type: Research article
DOI: http://dx.doi.org/10.1127/0077-7749/2009/0008
Publication date: 2009-10-01
- Neues Jahrbuch für Geologie und Paläontologie continuously publishes current original contributions from all fields of geology, ever since its foundation in 1807. All published contributions are in the English language.
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