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Sedimentary Structures in the Keuper Marl (Upper Triassic)

Published online by Cambridge University Press:  01 May 2009

George DeVries Klein
George DeVries Klein
Affiliation:
Geology Department, University of Pittsburgh, Pittsburgh 13, U.S.A.
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Abstract

Combinations of sedimentary structures in the lacustrine Keuper Marl are segregated bathymetrically. Beds deposited below lacustrine wave base are characterized by even bedding, rhythmic lamination, disturbed stratification, graded bedding, load casts, “pull-apart” structures, and oscillation ripple marks. Lacustrine beds deposited above wave base contain even bedding, rhythmic lamination, oscillation and interference ripple marks, current lineation, rib-and-furrow structure, groove casts, mudcracks, and raindrop imprints.

A marine unit in the Keuper Marl is characterized by even bedding, flat-topped oscillation ripple marks, and air-heave structures.

Comparison with sedimentary structures of other known lacustrine deposits suggests that the combination of structures in the non-marine Keuper Marl is diagnostic of lacustrine deposits. Recognition of such combinations of sedimentary structures should aid in interpreting the origin of continental sequences.

Type
Articles
Information
Geological Magazine , Volume 99 , Issue 2 , April 1962 , pp. 137 - 144
Copyright
Copyright © Cambridge University Press 1962

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