Epeiric Depositional Models for the Lower Cretaceous Washita Group, North-Central Texas

Abstract
The Washita Group in North-Central Texas and southeastern Oklahoma consists of up to 114 m of intercalated shale, limestone, and sandstone that accumulated in the shallow, epicontinental sea of the East Texas Basin. The Ouachita-Arbuckle Mountains to the north supplied terrigenous sediments, and the Central Texas platform to the south was a site of carbonate deposition leeward of the shelf margin of the Stuart City trend. Eleven lithofacies of the Washita were deposited within a repeatedly subsiding shelf basin that received an intermittent supply of terrigenous sediment. The deepest seaway formed after subsidence and was filled by a south-to-north progression of facies consisting of mollusk-echinoid wackestone on a shallow shelf, transitional packstone shale of deeper water, calcareous and sandy shales of the deepest water, thin-bedded sandstone of the shallower water shoreface, wavy lenticular sandstone and shale of the distal delta front, and deltaic estuarine trough-crossbedded sandstone. Following basin filling, the carbonate shelf prograded northward, grading into nearshore sediments. This produced the south-to-north succession of mollusk-echinoid wackestone to either oyster packstone shale, oyster packstone and quartzitic-oyster packstone or quartzitic mollusk-echinoid packstone of the shoreface.
Authors
Robert William Scott
D. Fee
R. Magee
Hooman Laall
Citation

Scott, R. W., Fee, D., Magee, R., and Laali, H., 1978, Epeiric Depositional Models for the Lower Cretaceous Washita Group, North-Central Texas: The University of Texas at Austin, Bureau of Economic Geology, Report of Investigations No. 94, 23 p.

Code
RI094
ISSN
2475-367X
Number
94
Number of figures
15
Number of pages
23
Publisher
The University of Texas at Austin, Bureau of Economic Geology
Series
Report of Investigation
Year
1978