- GeoRef, Copyright 2004, American Geological Institute. Reference includes data from Bibliography and Index of Geology Exclusive of North America, Geological Society of America, Boulder, CO, United States
"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."