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National Geologic Map Database

Geologic Unit: Kirtland

Usage:

Kirtland Shale (CO*,NM*)
Kirtland Formation (CO,NM)


Subunits:

(alphabetical): Bisti Member (CO,NM), De-Na-Zin Member (NM), Farmington Sandstone Member (CO*,NM*) or Farmington Member (NM), Hunter Wash Member (NM), Naashoibito Member (NM*).


Geologic age:

Late Cretaceous to Paleocene*


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

Named from exposures at Kirtland Post Office, San Juan Co., NM (Bauer, 1916).


AAPG geologic province:

San Juan 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 ([ ]).