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Paleocene Coal Deposits of the Wilcox Group, Central Texas

By
Robert W. Hook
Robert W. Hook
U.S. Geological Survey contract employee, Austin
,
Texas, U.S.A.
.
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Peter D. Warwick
Peter D. Warwick
U.S. Geological Survey, Reston
,
Virginia, U.S.A.
.
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John R. SanFilipo
John R. SanFilipo
U.S. Geological Survey, Reston
,
Virginia, U.S.A.
.
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Adam C. Schultz
Adam C. Schultz
Previously with U.S. Geological Survey, Reston
,
Virginia, U.S.A.
.
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Douglas J. Nichols
Douglas J. Nichols
*
U.S. Geological Survey, Denver
,
Colorado, U.S.A.
.
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Sharon M. Swanson
Sharon M. Swanson
U.S. Geological Survey, Reston
,
Virginia, U.S.A.
.
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Published:
January 01, 2011

Abstract

Coal deposits in the Wilcox Group of central Texas have been regarded as the richest coal resources in the Gulf Coastal Plain. Although minable coal beds appear to be less numerous and generally higher in sulfur content (1 percent average, as-received basis; table 1) than Wilcox coal deposits in the Northeast Texas and Louisiana Sabine assessment areas (0.5 and 0.6 percent sulfur, respectively; table 1), net coal thickness in coal zones in central Texas is up to 32 ft thick and more persistent along strike (up to 15 mi) at or near the surface than coals of any other Gulf Coast assessment area. The rank of the coal beds in central Texas is generally lignite (table 1), but some coal ranks as great as subbituminousC have been reported (Mukhopadhyay, 1989). The outcrop of the Wilcox Group in central Texas strikesnortheast, extends for approximately 140 mi between the Trinity and Colorado Rivers, and covers parts of Bastrop, Falls, Freestone, Lee, Leon, Limestone, Milam, Navarro, Robertson, andWilliamson Counties (Figure 1). Three formations, in ascending order, the Hooper, Simsboro, and Calvert Bluff, are recognized in central Texas (Figure 2). The Wilcox Group is underlain conformably by the Midway Group, a mudstone-dominated marine sequence, and is overlain and scoured locally by the Carrizo Sand, a fluvial unit at the base of the Claiborne Group.

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Contents

AAPG Studies in Geology

Geologic Assessment of Coal in the Gulf of Mexico Coastal Plain

Peter D. Warwick
Peter D. Warwick
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Alexander K. Karlsen
Alexander K. Karlsen
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Matthew Merrill
Matthew Merrill
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Brett J. Valentine
Brett J. Valentine
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American Association of Petroleum Geologists
Volume
62
ISBN electronic:
9781629810256
Publication date:
January 01, 2011

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