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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract

Volume: 19 (1935)

Issue: 10. (October)

First Page: 1508

Last Page: 1537

Title: Fredericksburg Group of Lower Cretaceous with Special Reference to North-Central Texas

Author(s): Sheridan A. Thompson

Abstract:

The Edwards limestone, Comanche Peak limestone, and Walnut clay are reduced to the status of members of one formation, which is given the name Gatesville from the type locality near the State Training School for Boys north of Gatesville, Coryell County, Texas. The Fredericksburg group is shown to include only two formations, the Kiamichi clay and the Gatesville. It is separated from the overlying Washita group in North-Central Texas and Southwest Texas by an unconformity, but in West Texas in Pecos County there is no indicated break in sedimentation. The contact with the underlying Trinity group is unconformable on the margins of the Comanche basin, while outward in the basin continuous deposition appears to have been maintained from uppermost Trinity into Fredericksburg. /P>

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