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  • Usage in publication:
    • Bearhead Rhyolite*
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Rhyolite
  • AAPG geologic province:
    • San Juan basin
Publication:

Bailey, R.A., Smith, R.L., and Ross, C.S., 1969, Stratigraphic nomenclature of volcanic rocks in the Jemez Mountains, New Mexico, IN Contributions to stratigraphy, 1968: U.S. Geological Survey Bulletin, 1274-P, p. P1-P19.


Summary:

Pg. P8. Bearhead Rhyolite of Keres Group. Rhyolite tuffs, flows, domes, and associated shallow intrusions. [Thickness not stated.] Includes Peralta Tuff Member (new). Unconformably overlies Paliza Canyon Formation of Keres Group; interfingers with Cochiti Formation; underlies gravel deposits. Age is middle Pliocene, [based on stratigraphic position].
[Type locality:] exposures on Bearhead Peak, Jemez Mountains, Santo Domingo Pueblo quadrangle, Sandoval Co., north-central NM, one of the larger source vents of the formation.

Source: Publication; US geologic names lexicon (USGS Bull. 1520, p. 22).


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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