Usage:
Black Canyon Schist (CO*)
Geologic age:
Paleoproterozoic*
Type section, locality, area and/or origin of name:
Best and most accesible exposures are in walls of Black Canyon from Sapinero to the Curecanti granite and up Lake Fork Canyon to granite mass 1 mi above Vanguard [no longer exists; was about 10 mi northwest of Powderhorn, in center of N/2 sec. 32, T. 48 N.,R. 3 W., approx. Lat. 38 deg. 22 min. 13 sec. N., Long. 107 deg. 14 min. 09 sec. W., Gateview 7.5-min quadrangle, Gunnison Co., central western CO]. Named from Black Canyon of Gunnison River, Montrose Co., central western CO (Hunter, 1925).
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 ([ ]).