Usage:
Helena Canyon Member of Manitou Formation (CO)
Geologic age:
Early Ordovician
Type section, locality, area and/or origin of name:
Type section: along Shelf Road in Cripple Creek, in sec. 22, T. 16 S., R. 70 W., Helena Canyon, Fremont Co., CO. Named from Helena Canyon (Gerhard, 1972).
AAPG geologic province:
Denver basin
Piceance basin
South Park 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 ([ ]).