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National Geologic Map Database

Geologic Unit: San Pedro Arroyo

Usage:

San Pedro Arroyo Formation of Chinle Group (NM)


Subunits:

Ojo Huelos Member (NM).


Geologic age:

Triassic, Late
Carnian, late


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

Type section: broad outcrop belt in arroyo and beyond, north of Carthage, Socorro Co., central NM (Lucas, 1991).


AAPG geologic province:

Orogrande basin
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 ([ ]).