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Geologic Unit: Millican
Map showing publication footprint
  • Usage in publication:
    • Millican formation*
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Sandstone
    • Limestone
    • Conglomerate
  • AAPG geologic province:
    • Southwestern Basin-and-Range region
Publication:

Richardson, G.B., 1914, Description of the Van Horn quadrangle, Texas: U.S. Geological Survey Geologic Atlas of the United States Folio, Van Horn folio, no. 194, 9 p.


Summary:

Millican formation. Fine-grained red sandstone, cherty limestone, and conglomerate. Unconformably underlies Van Horn sandstone and overlies (relations concealed) Carrizo formation. Age is pre-Cambrian.
Named from Millican's Ranch, 10 mi northwest of Van Horn, [Hudspeth Co.], Sierra Diablo region, TX.

Source: US geologic names lexicon (USGS Bull. 896, p. 1372).


Map showing publication footprint
  • Usage in publication:
    • Millican formation†
  • Modifications:
    • Abandoned
Publication:

King, P.B., 1940, Older rocks of Van Horn region, Texas: American Association of Petroleum Geologists Bulletin, v. 24, no. 1, p. 143-156. [Available online, with subscription, from AAPG archives: http://www.aapg.org/datasystems or http://search.datapages.com]


Summary:

Pg. 148. Millican formation of Richardson (1914) abandoned. Unit divided into two formations, Hazel sandstone (reinstated) above and Allamoore limestone (new) below. [See entries under Hazel and Allamoore.]

Source: US geologic names lexicon (USGS Bull. 1200, p. 2507).


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 ([ ]).

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