Quirnbach formation
The Quirnbach Formation is a lithostratigraphic rock unit of the Rotliegend of the Saar-Nahe basin in the history of the earth . It follows the Wahnwege formation and is overlaid by the Lauterecken formation . The chronostratigraphic dating is not entirely certain. Presumably, however, it is to be placed in the basal Permian ( Asselium ).
Naming and conceptual history
The Quirnbach formation is named after the place Quirnbach / Pfalz in the district of Kusel in Rhineland-Palatinate . The name was introduced in 1971 by Otto Atzbach and Klaus Schwab in the explanations of the geological map of Rhineland-Palatinate 1: 25000 sheet no. 6410 Kusel as Quirnbach layers . Jürgen Boy and Jürgen Fichter used the term in 1982 in the form of Quirnbach layers . Karl Stapf then changed the term in 1990 in line with the guidelines for lithostratigraphy in Quirnbach formation .
Definition, Correlation and Age
The formation consists primarily of gray and gray-brown fine sandstones and claystones , but also limestone , tuff and coal layers. Red sandstones and "black pelites" are also included in various sections of the profile, and seldom conglomerates . The lower limit of the formation is defined with the onset of the gray, clastic sediments. The upper limit is the lower edge of the so-called Feist conglomerate. The thickness is 170 to 350 m, in the type region near Quirnbach 240 m. The sediments of the Quirnbach Formation were mainly deposited under lacustrine conditions. Around St. Wendel there was a local lake, the Concordia Lake, which is primarily documented by the formation of stromatolites . Another lake, predominantly dominated by carbonate deposits, was near Nerzweiler , the so-called Stiehlberg lake . Sea horizons that persist over long stretches are detectable from the middle of the formation, the lower sea horizon is the deposits of the so-called Immetshausen lake . In the upper third of the formation, three more sea horizons have developed, the so-called Galgenberg banks. Above it follows the sea horizon of the Hohenöllen Bank. The overview of the Quirnbach Formation contains the following distinctive banks, which are also used for local and regional correlation:
- Gailbach Bank
- Blochersberg Bank
- Bubach and Roßbach Bank
- Hohenöllen Bank
- Broad meadow tuff
- Upper Galgenberg bench
- Middle Galgenberg bench
- Lower Galgenberg bench
- Immetshausen Bank
- Concordia Bank
- Stiehlberg Bank
Storage room and fossils
The deposit area was characterized by smaller rivers with river plains and moderately deep lakes. The large fluctuations in thickness are due to the fact that at the time of the Quirnbach formation, the Saar-Nahe basin was divided into individual sub-basins with different subsidence rates along NW-SE trending transverse faults.
The formation is considered to be relatively rich in fossils. The plants were adapted to moist conditions. In invertebrates, mussels , stromatolites , arthropods ( mussel crabs , gill crabs , syncarid crabs ), the problematic cuselina , xenacanthid sharks , bony fish (almost exclusively Paramblypterus ) and rarely amphibians were found . Traces of amphibians have been handed down in the fine-grained sediments of the formation.
swell
literature
- State Office for Geology and Mining Rhineland-Palatinate (Hrsg.): Geology of Rhineland-Palatinate. 400 p., E. Schweizerbart´sche Verlagsbuchhandlung Stuttgart 2005.
- 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 decline. 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
- ↑ Jürgen A. Boy and Jürgen Fichter: On the stratigraphy of the Saar-Palatinate Rotliegend (? Ober-Karbon - Unter-Perm; SW-Germany). Journal of the German Geological Society, 133: 607-642, Hanover 1982
- ^ 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 .
- ^ Stapf (1990: p. 118)
- ↑ Lithostratigraphy of the Quirnbach Formation ( Memento of the original from April 8, 2016 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
- ↑ 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
