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Map showing publication footprint
  • Usage in publication:
    • Gunsight formation
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Shale
    • Limestone
  • AAPG geologic province:
    • Bend arch
Publication:

Plummer, F.B., 1919, Preliminary paper on the stratigraphy of the Pennsylvanian formations of north-central Texas, with discussion: American Association of Petroleum Geologists Bulletin, v. 3, no. 1, p. 132-150. [Available online, with subscription, from AAPG archives: http://www.aapg.org/datasystems or http://search.datapages.com]


Summary:

Pg. 133-145. Gunsight formation, 3rd from base of 7 formations in Cisco division. Consists of shales, sandy shales, and thin limestones, approximately 100 feet thick, underlying Breckenridge formation and overlying Bunger formation. Top member is Gunsight limestone. Age is Late Pennsylvanian. Report area in Brazos River Valley, north-central Texas.
[GNC remark: Gunsight formation abandoned. Is part of Graham formation, adopted name.]

Source: US geologic names lexicon (USGS Bull. 896, p. 890); supplemental information from GNU records (USGS DDS-6; Denver GNULEX)..


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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