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National Geologic Map Database

Geologic Unit: Bergen

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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).