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National Geologic Map Database

Geologic Unit: Kreyenhagen

Usage:

Kreyenhagen Formation (CA*)
Kreyenhagen Shale (CA*)


Subunits:

(alphabetical): Bear Canyon Sandstone Member, Canoas Siltstone Member*, Gredal Shale Member*, Nortonville Shale Member*, Point of Rocks Sandstone Member*, Tumey Sandstone Lentil, Welcome Shale Member*.


Geologic age:

early Tertiary (Eocene to Oligocene)*


Type section, locality, area and/or origin of name:

Type locality: at Kreyenhagen wells, on Canoas Creek in central part of Reef Ridge area, about 12 mi south of town of Coalinga, Fresno Co., central CA. Named from Kreyenhagen wells (Anderson, 1905).


AAPG geologic province:

San Joaquin 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 ([ ]).