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Geologic Unit: Equus
Map showing publication footprint
  • Usage in publication:
    • EQUUS beds†
  • Modifications:
    • Abandoned
Publication:

Wilmarth, M.G., 1938, [Selected Geologic Names Committee remarks], IN Wilmarth, M.G., 1938, Lexicon of geologic names of the United States (including Alaska): U.S. Geological Survey Bulletin, 896, pts. 1-2, 2396 p.


Summary:

†EQUUS beds. A paleontologic name applied to Pleistocene deposits containing EQUUS remains. Replaced with different geographic names in different areas: In Kansas, with McPherson formation; in western Texas with Tule formation (also called "Rock Creek beds," but that name is preoccupied); in Nebraska and adjacent States the name "Sheridan formation" has been used, but that name also is preoccupied. The USGS in general calls the beds containing EQUUS remains the EQUUS zone, but McPherson formation and Tule formation are also in good standing in their respective regions.

Source: US geologic names lexicon (USGS Bull. 896, p. 694).


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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