Usage:
Twowells Tongue of Dakota Sandstone (AZ*,CO*,NM*)
Geologic age:
early Late Cretaceous (Cenomanian)*
Type section, locality, area and/or origin of name:
Exposures near Two Wells, in T. 12 N., R. 19 W., McKinley Co., NM. Named from Two Wells (Pike, 1947).
AAPG geologic province:
San Juan basin*
Black Mesa basin*
Orogrande basin*
Basin-and-Range province*
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 ([ ]).