Usage:
Bergen Shale Member of Lykins Formation (CO*)
Geologic age:
Permian*
Type section, locality, area and/or origin of name:
Type locality: in roadcut on Highway 74 just west of business district of town of Morrison and in west fork of Glennon Canyon, Golden-Morrison area, [Jefferson Co.], north-central CO. Named from Bergen irrigation ditch, which cuts through Lyons sandstone in Turkey Creek, in sec. 12, T. 5 S., R. 70 W., Morrison quadrangle, [Jefferson Co.], north-central CO (LeRoy, 1946).
AAPG geologic province:
Denver 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 ([ ]).