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Triassic-Jurassic Red Beds of the Rocky Mountain Region: Another Discussion

John G. Bartram
The Journal of Geology
Vol. 38, No. 4 (May - Jun., 1930), pp. 335-345
Stable URL: http://www.jstor.org/stable/30058952
Page Count: 11
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Triassic-Jurassic Red Beds of the Rocky Mountain Region: Another Discussion
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Abstract

This article is a discussion of four detailed cross-sections that show correlations of the Triassic-Jurassic red beds in Wyoming. Individual beds have been recognized and traced over considerable areas, so that correlations can be satisfactorily made with the type localities of the Sundance formation in the Black Hills and of the Chugwater formation north of Cheyenne. It is concluded that the name Chugwater should only be used in the "restricted" manner suggested by Reeside; that the Jelm should be enlarged to include all Upper Triassic beds; and that the Nugget sand and overlying red beds belong in the Sundance formation.

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