UT Permanent Collection - murphotos

Conglomerate (Building Stone), Gillespie County, Texas

Specimen Location: Outcrops along the west valley wall of Threadgill Creek upstream from Lange's Mill, Gillespie County, Texas.
Rock Description: Lower Cretaceous basal conglomerate with pebbles of limestone from the Threadgill member, the Wilberns formation, and the
Cap Mountain limestone member; also some hard quartzite pebbles of Welge and Hickory sandstone and very rarely a small pebble of granite and some chert.
Specimen dimensions: 13 x 10 x 4.5 cm
Weight: 760 grams
UT Collection ID: TMM-2232
Virgil Barnes described, "the most desirable conglomerate yet found lies
above the Ordovician Threadgill member of the Tanyard formation and the
Wilberns formation in the Lange's Mill area" on p. 158 of "Building Stones of Central Texas", Univ. of TX publication No. 4246, 1942. I believe that this is a sample that Virgil collected from that location.
In the permanent collection of the Jackson School of Geosciences, University of Texas at Austin.

20150928Building Stones of Central TexasLange's MillUniv. of Texas Publicaton No. 4246University of Texas at Austinbasal Cretaceous Conglomeratesbuilding stonecollection reference TMM 2232RockVirgil E. BarnesGillespie CountyconglomerateCretaceous