Delusional formation

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Lithostratigraphic structure of the permocarbon of the Saar-Nahe basin, abbreviations: O. = Upper, M. = Middle, U. = Lower, Subgr. = Subgroup, Nierst.-F. = Nierstein formation

The Wahnwege formation is a lithostratigraphic rock unit of the Rotliegend of the Saar-Nahe basin in the history of the earth . It follows the Altenglan formation and is overlaid by the Quirnbach formation . According to biostratigraphic data, the chronostratigraphic boundary Carbon / Permian lies in the Wahnwege formation .

Naming and conceptual history

The Wahnwege formation is named after the place Wahnwegen in the Kusel district in Rhineland-Palatinate . The name was already used in 1910 by Ludwig von Ammon and Otto Maria Reis as the "Wahnweger level" in literature. In 1914 Paul Kessler changed the name to "Wahnweger layers". Karl Stapf changed the term again in 1990 in line with the guidelines for lithostratigraphy in Wahnwege formation.

Definition, Correlation and Age

The lower part of the Wahnwege formation consists predominantly of red sandstones and conglomerates , otherwise of red, more rarely also gray claystones , fine stones and carbonate concretions . Gray claystones and fine sandstones as well as limestone banks , a tuff (Wetschert tuff) and a coal seam are seldom switched on. The thickness is 120 to 230 m, at the type locality at Wahnwege 220 m. The lower limit to the Altenglan Formation is a color change in the clay stones from gray to red. The upper limit is formed by the base of the Wahnweger border conglomerate. The most important lead benches within the Wahnwege formation are:

  • Border conglomerate
  • Nerzweiler Bank
  • Rammelsbach coal seam
  • Wetschert-Tuff
  • Aschbach Bank

The chronostratigraphic boundary Carbon / Permian is presumably within the Wahnwege formation.

Storage room and fossils

The lower part was deposited in a branched river, the higher parts in wide river plains and in lakes. The limestone concretions are interpreted as caliche . Silicified trunk fragments of Cordaites were found in the conglomerates. Ferns, horsetail and remains of walchia were found in the gray sections. In animal fossils, there are mussels, rarely freshwater snails, mussel crabs, arthropods and many remains of fish ( xenacanthid and hybonodontid sharks, bony fish , acanthodians and coelacanth ). Amphibian tracks were also found locally.

swell

literature

  • Manfred Menning, Reinhard Benek, Jürgen Boy, Bodo-Carlo Ehling, Frank Fischer, Birgit Gaitzsch, Reinhard Gast, Gotthard Kowalczyk, Harald Lützner, Wolfgang Reichel and Jörg W. Schneider: Das Rotliegend in the Stratigraphic Table of Germany 2002 - "Paternoster- Stratigraphy ”on the retreat. Newsletters on Stratigraphy, 41 (1-3): 91-122, Stuttgart 2005 ISSN  0078-0421
  • Andreas Schäfer: Sedimentologically-numerically based stratigraphic standard for the permo-carbon of the Saar-Nahe basin. Courier Forschungsinstitut Senckenberg (Stratigraphie von Deutschland V - Das Oberkarbon (Pennsylvanium) in Germany), 254: 369–394, Frankfurt 2005 ISBN 3-510-61380-5
  • Thomas Schindler and Ulrich HJ Heidtke (eds.): Coal swamps, lakes and semi-deserts. Pollichia special publication, 10: 1–316, Neustadt an der Weinstrasse, 2007.
  • Karl RG Stapf: Introduction of lithostratigraphic formation names in the Rotliegend of the Saar-Nahe basin (SW Germany). Messages from Pollichia, 77: 111-124, Bad Dürkheim 1990 ISSN  0341-9665 .

Individual evidence

  1. ↑ a b Jürgen A. Boy and T. Schindler: Ökostratigraphische Bioevents in the border area Stefanium / Autunium (highest carbon) of the Saar-Nahe-Basin (SW-Germany) and neighboring areas. New yearbook for geology and palaontology, treatises, 216: 89-152, Stuttgart.
  2. ↑ Ludwig von Ammon and Otto M. Reis: Explanations on the sheet Kusel of the geognostic map of the Kingdom of Bavaria 1: 100,000. 186 pp., Munich 1910.
  3. ^ Paul Kessler: Attempt to determine the time of the disturbance processes in the Saar-Nahe area. Geological-Palaeontological Treatises, New Series, 13: 125-220, Jena 1914 Online at archive.org
  4. ^ Fritz F. Steininger and Werner E. Piller: Recommendations (guidelines) for handling the stratigraphic nomenclature. Courier Forschungsinstitut Senckenberg, 209: 1-19, Frankfurt am Main 1999, ZDB -ID 530500-7 .
  5. ^ Stapf (1990: p. 118)
  6. ↑ Important lithostratigraphic units in the Wahnwege formation  ( page no longer available , search in web archives )  Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice.@1@ 2Template: Dead Link / www.lgb-rlp.de  
  7. ↑ a b Thomas Schindler: Geology, stratigraphy and genesis of the permocarbonic Saar-Nahe basin. In: Thomas Schindler and Ulrich HJ Heidtke (eds.): Coal swamps, lakes and semi-deserts. Pollichia special publication, 10: 4-37, Neustadt an der Weinstrasse, 2007

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