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Map showing publication footprint
  • Usage in publication:
    • Speck Mountain clay bed
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Clay
    • Sandstone
  • AAPG geologic province:
    • Bend arch
Publication:

Drake, N.F., 1893, Report on the Colorado coal field of Texas, IN Fourth annual report of the Geological Survey of Texas, 1892: Geological Survey of Texas Annual Report, v. 4, p. 357-444. [Available online from the University of Texas-Austin library: http://www.lib.utexas.edu/books/dumble/]


Summary:

Pg. 387, 407. Speck Mountain clay bed in Cisco division. Fossiliferous sandy clay, bluish, purplish, or slightly red, 25 feet thick, with a little sandstone and some carbonaceous shaly clay. Member of Cisco division [Cisco is 2nd from top of 5 Carboniferous divisions of Cummins, 1891]. Overlies BELLEROPHON bed and underlies Speck Mountain limestone bed. Age is Pennsylvanian.
[Named from Speck Mountain, Coleman Co., Colorado River region, central TX.] Well exposed at base of mountain.

Source: Publication; US geologic names lexicon (USGS Bull. 896, p. 2038).


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 ([ ]).

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