--> Sequence-Stratigraphic History of the Eocene Claiborne Group, Yegua, Cook Mountain, Weches, Sparta, Queen City and Reklaw Formations in the Subsurface of the Central Texas Gulf Coast, Colorado and Wharton Counties, Texas, by R. A. Hull; #90986 (1994).

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Abstract: Sequence-Stratigraphic History of the Eocene Claiborne Group, Yegua, Cook Mountain, Weches, Sparta, Queen City and Reklaw Formations in the Subsurface of the Central Texas Gulf Coast, Colorado and Wharton Counties, Texas

Robert A. Hull

Twenty-five seismic lines, fifty-seven paleontological reports, sixty-four synthetic seismograms, well logs and conventional core data over a 2500 sq.-mile area were utilized to understand the sedimentary environments occurring along the shelf-slope break of the Claiborne Group. Seismic data and cross sections are interpreted showing the Claiborn Group expanding out over the Wilcox Group. Seismic reflector continuity can be utilized to distinguish the transgressive from highstand systems tracts. Within the well log cross sections, a sequence boundary occurs between the highstand systems tract of the upper Wilcox and the transgressive Reklaw. The Queen City Formation is interpreted within a highstand system tract. The Weches Formation is deposited within a transgressive and highstand s stems tract. The Sparta Formation and lower Cook Mountain are deposited within a transgressive systems tract. The author subdivides the Cook Mountain Formation into two members. The upper Cook Mountain member consists of a thick highstand systems tract. Within the Yegua Formation, a type 1 sequence boundary (age P14) and one third-order lowstand basinward thinning, prograding complex is interpreted. Depositional environments of the prograding complex are middle neritic to upper bathyal. A transgressive sand near the top of the prograding complex on the shelf is interpreted as an incised valley. Four highstand systems tracts overlying the prograding complex are separated by a thin transgressive systems tracts. At least five type 2 sequence boundaries, three shelf margin wedges, highstand nd transgressive systems tracts younger than the prograding wedge, are identified in the regional well log cross sections within the Yegua Formation.

AAPG Search and Discovery Article #90986©1994 AAPG Annual Convention, Denver, Colorado, June 12-15, 1994