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A preliminary report on the bentonite beds of the lower Virgin Creek Member of the Pierre Shale, Stanley County, South Dakota ( USA).

Mountain Geologist

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Abstract

The Virgin Creek Member of the Pierre Shales has been divided by earlier workers into lower and upper zones based on weathering and shale differences. Of the 49 bentonite beds of the lower Virgin Creek, the Government Draw Bentonite Beds, and bentonite bed 20 are the best markers for correlation from stream valley to stream valley. The variation of number and thickness of shale and bentonite beds is due to bioturbation, current activity, differential compaction, basin subsidence, and merging and splitting of bentonite beds. Three distinctive concretion horizons have the potential of also being used as stratigraphic markers within the study area. They include a nodule zone between two bentonite beds, barite(?) concretions that locally mark the lower contact of the Virgin Crrek, and a set of concretions at the contact between the upper and lower Virgin Creek. -from Author

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
A preliminary report on the bentonite beds of the lower Virgin Creek Member of the Pierre Shale, Stanley County, South Dakota ( USA).
Series title:
Mountain Geologist
Volume
24
Issue:
3
Year Published:
1987
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Mountain Geologist
First page:
81
Last page:
85
Number of Pages:
5