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EUR-09 Geology of the Southern Permian Basin area - Part 2
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Triassic stratigraphy and facies of the Southern Permian Basin area
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Gerhard H. Bachmann, Martin-Luther-Universität Halle-Wittenberg (Germany)
Anna Becker, Polish Geological InstituteWarzawa (Poland)
Gerhard Beutler, Martin-Luther-Universität Halle-Wittenberg (Germany)
Mark Geluk, Shell Exploration Production (Netherlands)
Hans Hagdorn, Muschelkalkmuseum Ingelfingen (Germany)
Mark W. Hounslow, University of Lancaster (United Kingdom)
Lars H. Nielsen, GEUS (Denmark)
Edgar Nitsch, Landesamt für Geologie, Rohstoffe und Bergbau (Germany)
Heinz-Gerd Röhling, Landesamt für Bergbau, Energie und Geologie (Germany)
Theo Simon, Landesamt für Geologie, Rohstoffe und Bergbau (Germany)
Achim Szulc, University of Krakov (Poland)
Geoff Warrington, University of Leicester (United Kingdom)
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The name "Trias" was introduced by Friedrich von Alberti (1834) for a tripartite succession in southern Germany. This succession, now named the "Germanic Triassic", has the lithostratigraphical rank of a supergroup and consists of the predominantly continental Buntsandstein, the marine and hypersaline Muschelkalk and the continental, brackish and hypersaline Keuper groups. Each group is subdivided into Lower, Middle and Upper subgroups; in turn these are constituted from formations, some of which are further subdivided into members.
The classic tripartite German lithostratigraphy is valid for large parts of the SPBA and can, therefore, be used as a reference to which other lithostratigraphic schemes, from the eastern UK and Poland, are correlated.
Correlation with the Tethyan Triassic is well established using ammonoid, bivalve, crinoid, conodont, conchostracan, palynological and magnetostratigraphical data. Imported age data are used for the numerical calibration of the stage boundaries. Attempts to improve the numerical ages by astronomical calibration have been considered as many cycles seem to represent distinct ∼100 ka eccentricity cycles.
More than 12 sequences, or base level cycles, can be recognized in the Triassic succession, each bounded by more or less pronounced unconformities (sequence boundaries).
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