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Geologic Unit: Aylor
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  • Usage in publication:
    • Aylor member
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Limestone
  • AAPG geologic province:
    • Llano uplift
Publication:

Plummer, F.B., 1947, Lower Pennsylvanian strata of the Llano region, summary of classification: Journal of Paleontology, v. 21, no. 2, p. 142-146., Revised IN Wanless, H.R., 1947, "Symposium on Pennsylvanian problems," Jour. Geol., v. 55, no. 3, pt. 2, p. 193-201. See also GSA Bull., v. 57, no. 12, pt. 2, p. 1273, 1946 [abs.]


Summary:

Pg. 142, 143, 144. Aylor member of Big Saline formation. Consists of light-gray crystalline limestone and oolite. In vicinity of Colorado River, oolite increases in thickness to form a lentil 5 miles long and 10 to 100 feet thick. Underlies Lemons Bluff member; overlies Gibbons member. Age is Early Pennsylvanian.
Type section: on Aylor Bluff in McAnnelly's Bend of Colorado River [San Saba Co.] central TX.
[See also, 1947, Jour. Geol., v. 55, no. 3, pt. 2, p. 196, 197; 1950, Univ. Texas Bur. Econ. Geol. Pub., no. 4329, p. 64-66.]

Source: US geologic names lexicon (USGS Bull. 1200, p. 184).


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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