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- Usage in publication:
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- Blockhouse shale*
- Modifications:
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- Named
- Dominant lithology:
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- Shale
- AAPG geologic province:
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- Appalachian basin
Summary:
Name Blockhouse shale here applied to dark-gray calcareous shale with thin beds and lenses of dark-gray dense limestone in Blockhouse quad., Blount Co., TN. Thickness ranges from 150 to 950 ft. In southwestern part of Tellico-Sevier belt, these fine-grained rocks are partly replaced by fine- to coarse-grained Toqua sandstone member (new), which underlies unnamed shale member. Thin argillaceous limestone forms basal member, and term Whitesburg limestone member is applied to it. Overlies Lenoir limestone; underlies Tellico formation. Blockhouse shale as defined in this report was included by Keith (1895: U.S. Geol. Survey Geol. Atlas, Folio 16) and Rodgers (1953) in lower part of Athens shale.
Source: 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.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).