--> Abstract: Sligo and Hosston Depositional Patterns, Subsurface of South Texas, by D. G. Bebout; #90967 (1977).

Datapages, Inc.Print this page

Abstract: Sligo and Hosston Depositional Patterns, Subsurface of South Texas

D. G. Bebout

The Sligo-Hosston depositional wedge is present over an area of thousands of square miles in South Texas. The wedge thickens downdip from its pinchout to more than 1,000 ft (300 m) at the shelf edge. The wedge can be subdivided into three major time-equivalent parts based on quartz-sandstone and carbonate facies and interpreted depositional environments--the Hosston, lower Sligo, and upper Sligo. The Hosston dolomitic quartz sandstone, dolomite, and anhydrite were deposited on an arid tidal flat; the abundance of sandstone decreases and the dolomite increases upward in the Hosston. The lower Sligo is characterized by several cycles which consist of burrowed subtidal dolomite at the base and laminated supratidal dolomite and anhydrite at the top. The upper Sligo consists p edominantly of subtidal skeletal wackestones to grainstones and thin oolitic grainstones.

The vertical sequence indicates an overall transgressive trend to the Sligo-Hosston depositional wedge; however, detailed sections show that this transgression was accomplished by means of several progradational cycles, each of which was shifted progressively landward of the previous one.

AAPG Search and Discovery Article #90967©1977 GCAGS and GC Section SEPM 27th Annual Meeting, Austin, Texas