Usage:
Las Animas Formation (CO*-subsurface)
Geologic age:
Mesoproterozoic*
Type section, locality, area and/or origin of name:
Type section (subsurface) for main part: depth-interval 2,045 to 6,210 ft, R.W. Lange No. 1 government test well, in SW/4 NW/4 sec. 10, T. 29 S., R. 62 W., Las Animas Co., CO. Named from Las Animas Co., CO (Tweto, 1983).
Reference section (subsurface) for upper part: depth-interval 1,115 to 2,570 ft., Phillips Petroleum Company No. 1, E.W. Haskins well, in NE/4 NE/4 sec. 23, T. 29 S., R. 56 W. (Tweto, 1983).
AAPG geologic province:
Southern Rocky Mountain region*
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 ([ ]).