Geologic Unit: Dockum

Usage:

Dockum Group (CO*,KS*,NM*,TX*)
Dockum Formation (NM*,OK*,TX*)
Dockum Formation of Chinle Group (TX)

Subunits:

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.

Geologic age:

Triassic, Middle* (local)
Triassic, Late*

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

Named from exposures in vicinity of town of Dockum, Dickens Co., western TX (Cummins, 1890).

AAPG geologic province:

Permian basin*
Las Vegas-Raton basin*
Palo Duro basin*
Sierra Grande uplift*
Anadarko basin*