Usage:
Monitor Butte Member of Chinle Formation (AZ*,CO*,NM*,UT*)
Geologic age:
Triassic, Late*
Type section, locality, area and/or origin of name:
Not designated. Origin of name not stated by author (Stewart, 1957).
Type locality: along Monitor Butte, about 14 mi northwest of Oljato, San Juan Co., UT (Witkind and Thaden, 1963).
Type section: at north end of Monitor Butte, in SE/4 sec. 3, T. 41 S., R. 13 E., San Juan Co., UT (Witkind and Thaden, 1963).
AAPG geologic province:
Paradox basin
Black Mesa basin*
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 ([ ]).