Kirtland Shale (CO*,NM*)
Kirtland Formation (CO,NM)
(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*).
Late Cretaceous to Paleocene*
Named from exposures at Kirtland Post Office, San Juan Co., NM (Bauer, 1916).
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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).