U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database

Geologic Unit: Ojo Alamo

Usage:

Ojo Alamo Sandstone (CO*?,NM*)
Ojo Alamo Formation (NM)


Subunits:

(alphabetical): Kimbeto Member (NM), Naashoibito Member (NM)


Geologic age:

Late Cretaceous and Paleocene*


Type section, locality, area and/or origin of name:

Not designated. Name from Ojo Alamo trading post in Chaco Canyon, about 95 mi northwest of Gallup and 25 mi west of the Bonito Indian Pueblo, San Juan Co., NM (Brown, 1910).
Type section of restricted Ojo Alamo measured in sec. 6, T. 24 N., R. 11 W., San Juan Co., NM (Baltz and others, 1966).
Type locality: Ojo Alamo Wash, T. 24 N., R. 11 and 12 W., San Juan Co., NM (Fassett, 1985).
Reference section designated and measured in sec. 9, T. 24 N., R. 11 W., San Juan Co., NM (Baltz and others, 1966).


AAPG geologic province:

San Juan basin*


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