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The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)

Abstract


Journal of Sedimentary Petrology
Vol. 32 (1962)No. 3. (September), Pages 472-474

Trough Cross-bedding

George R. Wulf

ABSTRACT

Small and large scale trough cross-bedding as defined by McKee and Weir (1953) is very common in the Cretaceous Newcastle Previous HitSandstoneNext Hit of the Black Hills area of Wyoming and South Dakota. Similar large scale trough cross-bedding occurs in the Paleocene Fort Union Formation of Wyoming. Based on the grain size of the Newcastle Previous HitSandstoneNext Hit, the minimum current velocity necessary to erode the troughs was about 20 cm/sec; deposition of the cross-beds probably occurred in current Previous HitvelocitiesTop of less than 3 cm/sec. The troughs were probably eroded by tidal currents and filled by sediments deposited from slow-moving delta distributaries.


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