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  • Usage in publication:
    • Blockhouse shale*
  • Modifications:
    • Named
  • Dominant lithology:
    • Shale
  • AAPG geologic province:
    • Appalachian basin
Publication:

Neuman, R.B., 1955, Middle Ordovician rocks of the type Tellico-Sevier belt, eastern Tennessee, IN Shorter contributions to general geology, 1955-57: U.S. Geological Survey Professional Paper, 274-F, p. F141-F178. [Available online from the USGS PubsWarehouse: http://pubs.er.usgs.gov/pubs/pp/pp274F]


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 usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).