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

Cheney, M.G., 1940, Geology of north-central Texas: American Association of Petroleum Geologists Bulletin, v. 24, no. 1, p. 65-118. [Available online, with subscription, from AAPG archives: http://www.aapg.org/datasystems or http://search.datapages.com]


Summary:

Pg. 66 (flg. 1), 84 (fig. 5), 85. Comyn formation. Name applied to subsurface section of Marble Falls group in Ranger area, Eastland County, north-central Texas. Includes beds below "limestone B" of Plummer and Moore's (1922) type log of the Ranger district. Unconformably underlies [De Leon] formation (new) of Big Saline group (Lampasas). Age is Early Pennsylvanian (Morrow). Younger than Mississippian (Meramec) Barnett shale.
Type section (subsurface): depth-interval 4,132 to 4,320 ft, Roxana Petroleum Company Seaman No. 1 test well, northwestern Palo Pinto Co., north-central TX. Named from town of Comyn, northern Comanche Co., north-central TX.
[Misprint (USGS Bull. 1200, p. 905): Comyn underlies De Leon Formation, not DeLeon Springs Formation.]

Source: US geologic names lexicon (USGS Bull. 1200, p. 905); supplemental information from GNU records (USGS DDS-6; Denver GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Comyn formation
  • Modifications:
    • Not used
Publication:

Cheney, M.G., 1947, Pennsylvanian classification and correlation problems in north-central Texas, IN Symposium on Pennsylvanian Problems: Journal of Geology, v. 55, no. 3, pt. 2, p. 202-219.


Summary:

Pg. 211. Plummer (1944, Texas Univ. Bur. Econ. Geol. Pub., no. 4401) assigned name Sloan to outcropping Morrowan rocks and this name should replace Comyn.

Source: US geologic names lexicon (USGS Bull. 1200, p. 905).


Map showing publication footprint
  • Usage in publication:
    • Comyn formation
  • Modifications:
    • Age modified
Publication:

Turner, G.L., 1957, Paleozoic stratigraphy of the Fort Worth basin: Abilene Geological Society Field Trip Guidebook, October 25-26, 1957, p. 57-78., Joint field trip of Abilene and Fort Worth Geol. Soc


Summary:

Pg. 63-64. Problem of whether the Comyn is Morrowan or late Mississippian has not been definitely resolved.

Source: US geologic names lexicon (USGS Bull. 1200, p. 905).


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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