Usage:
Castle Butte Member of Leadville Limestone (CO*)
Castle Butte Member of Leadville Dolomite (CO*-local)
Geologic age:
Early Mississippian (Tournaisian; Osagean)*
Type section, locality, area and/or origin of name:
Type area: exposures in Castle Butte on Aspen Mountain, Pitkin Co., west-central CO. Named from Castle Butte (Nadeau, 1972).
Principal reference section (measured by Tweto and Lovering, 1977, USGS Prof. Paper 956, p. 23-32): at Rock Creek, 0.4 mi northwest of Gilman, in SW/4 sec. 12, T. 6 S., R. 81 W., Leadville mining district, Lake Co., west-central CO (Beaty and others, 1988).
AAPG geologic province:
Eagle 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 ([ ]).