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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 12 (1928)

Issue: 10. (October)

First Page: 1015

Last Page: 1022

Title: An Altered Volcanic Ash from the Cretaceous of Western Kansas

Author(s): George R. Pinkley (2), Robert Roth (3)

Abstract:

This report contains a detailed micro-minerological analysis of an altered volcanic ash from the upper Niobrara Cretaceous of Logan County, Kansas. Its identity as an ash is positive, but it is not a true bentonite such as is common in rocks of the same age elsewhere in the west.

The ash extends throughout a considerable area, 2,000 square miles, with remarkable uniformity. It extends through 200 feet of columnar section. Deposition was made during a period of very quiet seas, as evidenced by little disturbance of the thin beds.

The several beds are of use in making a structure map of the area, as they are nearly parallel to the Niobrara-Pierre contact.

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