Obsolete. Name not used since its introduction. Unit named for feature in Sawatch Range, Southern Rocky Mountain region. Is impractically distinguished from Sawatch Schist [also considered obsolete]. Included with pre-1,700 m.y. (Precambrian X) metamorphic complex.
Source: GNU records (USGS DDS-6; Denver GNULEX).
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 ([ ]).