The Geology of Texas - Vol. 1 - pages 460-461

WOLFE CITY SAND

 Nomenclature.—This member was described by Stephenson (1530, p. 155), the type locality being near Wolfe City, Hunt County. Good localities mentioned by Stephenson are a cut of the Gulf, Colorado and Santa Fe Railway, 1½ miles east by north of Wolfe City, and railway ditches 4/5 to 1 mile east of Pecan Gap, Delta County. Synonym: Corsicana sand (of various authors, not of R. T. Hill, 1901).

Areal outcrop.—The member consists of 75 to 100 feet of fine, calcareous gray sand or sandy marl with a few round, oval or irregular concretions of calcareous sandstone. The sand weathers to greenish-yellow. Near the middle of the member is a more or less persistent layer of highly fossiliferous calcareous sandstone of varying thickness, which contains a large molluscan fauna. Some beds of calcareous clay occur in the upper part of the member, between the indurated layer and the overlying Pecan Gap chalk member. C. S. Ross (in 1535, p. 5) has described Wolfe City sand from near Wolfe City as follows:

The mineral grains are predominantly quartz, but smaller amounts of feldspar, mica, and other minerals, are present. The grains are sharply angular for the most part. The cementing material is finely granular calcite. The sand grains average about 0.05 mm. in diameter.

Kelsey and Denton (899b) state that the Wolfe City sand "is characterized by a comparatively large amount of zircon and a moderate amount of garnet;" titanite is usually present in moderate amounts; staurolite and rutile are relatively unimportant. 

In its type region the Wolfe City is 75 to 100 feet thick. It is not mapped farther southwest than central Rockwall County, though sands in its general stratigraphic position occur as far south as Falls and Bell counties (page 464), nor east of northwestern Delta County.

The following fossils are known from the Wolfe City member: Hoplito placenticeras sp. aff. H. vari, Baculites as per Morton, Scaphites (2 or more species), Inoceramus aff. barabini, Pecten aff. burlingtonensis, Liopistha (Cymella) bella (Conrad), Cardium (Criocardium) sp., Leptosolen biplicatus Conrad, Corbula crassiplica Gabb, Panope cf. decisa Conrad, Turritella trilira Conrad, and others. Further notes on the Wolfe City are given by Dane and Stephenson (391, pp. 42-45).