Usage:
Thatcher Limestone Member of Graneros Shale (CO*,NM*)
Geologic age:
Late Cretaceous*
Type section, locality, area and/or origin of name:
Not stated. Well exposed under east fence of U.S. Highway 350 across road from Keith's store at Thatcher, Las Animas Co., southeastern CO, and from that point northeastward for several mi. Forms prominent bench throughout Model anticline and adjacent region (Bass and others, 1947).
AAPG geologic province:
Las Vegas-Raton basin*
Sierra Grande uplift*
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 ([ ]).