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The AAPG/Datapages Combined Publications Database
West Texas Geological Society
Abstract
Depositional History of the Marble Falls Formation of the Llano Region, Central Texas
Abstract
Lithologic and paleontologic evidence demonstrate penecontemporaneous development of a Bahamian-like carbonate platform on the Llano Uplift in Morrowan time. Development of the lower Marble Falls platform was rapid. The platform quickly built to sea level, and high energy facies predominated.
The platform was a relatively short lived feature. During Morrowan time, relative sea level fell slightly exposing the platform to subaerial erosion. Deposition of shale and spiculitic biomicrite continued off the platform. With subsidence of the Llano area, carbonate facies were re-established.
Progressive subsidence of the Llano area and adjacent Eastern Shelf and progradation of Strawn-Smithwick deltas led to a westward shift in Marble Falls carbonate depocenters in a series of back steps. Contemporaneity of Marble Falls, Smithwick, and Strawn deposits is established by paleontologic data and facies relationships. Westward thinning and absence of the lower part of the Marble Falls is due to erosion.
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