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

Geologic Unit: San Angelo

Usage:

San Angelo Sandstone of Pease River Group (TX*)
San Angelo Formation of Pease River Group (TX*)
San Angelo Sandstone of El Reno Group (OK*)


Subunits:

Duncan Member (TX*).


Geologic age:

Middle Permian (Guadalupian)*


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

[Type locality]: a few mi west of San Angelo, Tom Green Co., northern TX (Lerch, 1891; see Henderson, 1928).


AAPG geologic province:

Bend arch*
Palo Duro basin*
Permian basin*


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 ([ ]).