Usage:
Cooper Arroyo Sandstone Member of Mancos Shale (NM*)
Geologic age:
Late Cretaceous*
Type section, locality, area and/or origin of name:
Type section: on Tierra Amarilla Grant, 3,000 ft S. 10 deg. W. of road intersection at BM 6966, which lies 3,600 ft south of NM Highway 112, and 500 ft west of eastern border of Boulder Lake quadrangle, Rio Arriba Co., NM. Outcrops begin about 650 ft south of Cooper Arroyo and 1400 ft west of eastern boundary of quadrangle (Landis and Dane, 1967).
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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).