- Usage in publication:
-
- Cochiti Formation*
- Modifications:
-
- Original reference
- Dominant lithology:
-
- Sand
- Gravel
- AAPG geologic province:
-
- San Juan basin
Summary:
Pg. P8-P9. Cochiti Formation. Volcanic gravel and sand. Formation is repeated by faulting, and full thickness is nowhere exposed. Interfingers with rocks of Keres Group (new). Age is early to middle Pliocene, [based on stratigraphic position].
[Type locality:] in the badlands west and southwest of Cochiti Pueblo, in western half of Santo Domingo Pueblo quadrangle and eastern half of Jemez quadrangle, Jemez Mountains, Sandoval Co., north-central NM. (Pronounced co'-chi-tee.)
Source: Publication; US geologic names lexicon (USGS Bull. 1520, p. 67).
- Usage in publication:
-
- Cochiti Formation*
- Modifications:
-
- Age modified
- AAPG geologic province:
-
- San Juan basin
Summary:
Age changed in San Juan basin from early to middle Pliocene to late Miocene to early Pliocene. Change based on stratigraphic position. Formation overlies a basalt with a 10.4 m.y. K-Ar age and underlies a basalt with a 2.6 m.y. K-Ar age.
Source: GNU records (USGS DDS-6; Denver GNULEX).
- Usage in publication:
-
- Cochiti Formation
- Modifications:
-
- Not used
- AAPG geologic province:
-
- San Juan basin
Connell, S.D., Koning, D.J., and Cather, S.M., 1999, Revisions to the stratigraphic nomenclature of the Santa Fe Group, northwestern Albuquerque basin, New Mexico: New Mexico Geological Society Field Conference Guidebook, no. 50, p. 337-354.
Summary:
Pg. 339 (fig. 3). Rocks previously assigned to Cochiti Formation by Manley (1978) and Tedford and Barghoorn (1997, New Mexico Mus. Nat. Hist. Sci. Bull., no. 11, p. 77-95) are reallocated to Arroyo Ojito Formation (new).
Source: Publication.
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 ([ ]).