Abstract

Analysis of the Wolfcampian Lenox Hills and Skinner Ranch Formations in the Leonard Mountain area, Glass Mountains, western Texas, indicates that these formations consist of calcirudite, calcarenite, biolithite, calcilutite, and dolomite lithofacies. Petrographically these lithofacies include biosparite, biopelmicrite, biomicrite, intrabiomicrite, poorly fossiliferous micrite, and replacement dolomite. Vertical and lateral variations of the lithofacies suggest that the entire Wolfcampian sequence represents a depositional continuum of subtidal and intertidal environments. Subtidal sedimentation developed in carbonate sand bars, which supported patch reefs, and in muddy lagoonal areas. A tidal channel-delta system prograded into shallow subtidal areas resulting in submarine highs, above which were areas of restricted circulation, evaporation, and mixing of abnormally saline and fresh waters. This created an environment for pervasive dolomitization and silicification by length-slow chalcedony similar to that of an intertidal environment.

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