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The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)

Abstract


Journal of Sedimentary Petrology
Vol. 32 (1962)No. 2. (June), Pages 327-329

Eroded Oscillation Ripple Marks in Cretaceous Newcastle Sandstone, Wyoming and South Dakota: NOTES

George R. Wulf

ABSTRACT

Two types of eroded oscillation ripple marks, (1) asymmetric and (2) flat-topped, occur in Cretaceous Newcastle Sandstone outcrops in Wyoming and South Dakota. The asymmetric type resulted from a shift of the ripple form just prior to burial; the steeper or eroded side faced seaward. The flat-top forms resulted from erosion of crests of regular oscillation ripple marks. Both types occur together in delta distributary sands and probably record the effects of incoming and outgoing tides.


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