Dockum Group (CO*,KS*,NM*,TX*)
Dockum Formation (NM*,OK*,TX*)
Dockum Formation of Chinle Group (TX)
GROUP STATUS (alphabetical): Baldy Hill Formation (CO,NM), Chinle Formation (CO*,NM*,TX), Santa Rosa Formation (NM*,TX*) or Santa Rosa Sandstone (NM*), Sheep Pen Sandstone (NM), Sloan Canyon Formation (CO,NM), Tecovas Formation (TX*), Travesser Formation (CO,NM), Trujillo Formation (TX*) or Trujillo Sandstone (NM,TX).
FORMATION STATUS (alphabetical) --all in TX: Bull Canyon member (informal), Camp Springs Member, Cooper Member or Cooper Shale Member, Iatan Member, Tecovas Member, Trujillo Member.
Triassic, Middle* (local)
Named from exposures in vicinity of town of Dockum, Dickens Co., western TX (Cummins, 1890).
Las Vegas-Raton basin*
Palo Duro basin*
Sierra Grande uplift*
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.
"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 ([ ]).