Usage:
Tansill Formation of Artesia Group (NM*,TX*)
Tansill Anhydrite of Artesia Group (NM*,TX*)
Subunits:
Ocotillo Silt Member (NM,TX).
Geologic age:
Middle Permian (Guadalupian)*
Type section, locality, area and/or origin of name:
Type locality: on Carlsbad-Artesia Highway (U.S. 285), 3.7 mi from Eddy County Courthouse in Carlsbad, in W/2 sec. 26, T. 21 S., R. 26 E., of NM Principal Meridian, [Carlsbad West 7.5-min quadrangle], Eddy Co., southeastern NM. Named from Tansill power dam [on Pecos River, Eddy Co., NM]. Locality is on east flank of elongate dome that forms prominent topographic feature northwest of Carlsbad (DeFord and Riggs, 1941).
Reference section (subsurface): depth-interval 1,040 to 1,144 ft, Humble Oil and Refining Company Federal Bogle No. 1 well, in sec. 30, T. 16 S., R. 30 E., Eddy Co., NM (Tait and others, 1962).
AAPG geologic province:
Permian 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 ([ ]).