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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 50 (1966)

Issue: 10. (October)

First Page: 2319

Last Page: 2319

Title: Stratigraphy of Georgetown Formation, Central Texas: ABSTRACT

Author(s): William Pope Wilbert

Article Type: Meeting abstract

Abstract:

The Cretaceous Georgetown Formation is composed of irregularly interbedded fossiliferous micrite (microcrystalline limestone) and marl beds that are profusely burrowed. Beds can be recognized through great distances and are practically synchronous throughout their lateral extent, at least in the area of this report.

The Georgetown Formation is divisible into five members. They are, in ascending order, the Duck Creek, Fort Worth, Denton, Weno, and Main Street Members. The members are lithologically consistent throughout northern Travis County and Williamson and Bell Counties, Texas; the members maintain an almost constant thickness, except that the upper two members thin slightly southward. The formation is approximately 95 ft. thick in northernmost Bell County and approximately 70 ft. thick at Austin, central Travis County; 75% of this southward thinning is in the Weno and Main Street Members.

The Georgetown conformably overlies the Kiamichi Formation in the area of the Round Rock syncline; it disconformably overlies the Edwards Formation above the Belton high and on the northeastern flank of the San Marcos arch. The Georgetown is overlain conformably by the Del Rio Formation. Deposition was continuous throughout the time of accumulation of the Georgetown Formation, except for the minor interruptions that produced bedding planes.

The Georgetown was deposited in an environment that contained abundant life and where no coarse terrigenous debris was deposited.

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Copyright 1997 American Association of Petroleum Geologists