- Usage in publication:
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- Bear Creek K-bentonite zone
- Modifications:
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- First used
- Dominant lithology:
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- Bentonite
Summary:
Bear Creek K-bentonite zone of Point Pleasant Formation. 1.2 m of strata within the Point Pleasant Formation of Ohio and Kentucky containing two to three impure K-bentonite beds is here informally named the Bear Creek K-bentonite zone. The Bear Creek beds occur as two lithologies: a biotite-rich rhythmite and a burrow fill with biotite-rich sediment. Thickness of the rhythmites ranges from 0.15 m to 0.46 m. Burrows range from 0.01 m to 0.03 m. Zone occurs 12.5 m to 13.7 m above the Lexington-Point Pleasant contact and is assigned to the Mohawkian (Shermanian) Stage. (According to authors, this K-bentonite bed originally recognized by Drs. Stig Bergstrom and Walter Sweet.)
[Uncertain if adopted by the Kentucky Geol. Survey.]
Source: Modified from GNU records (USGS DDS-6; Reston GNULEX).
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
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