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ABSTRACT

In central and eastern Alabama, late Santonian to latest Maastrichtian (85 to 67 Ma) paleogeographic changes in both gross depositional-strike mode and specific latitudinal position of shoreline trend are directly related, respectively, to second- and third-order changes of sea level. The third-order sea-level changes are eustatic in origin with minor exceptions. Owing to relative tectonic stability of the Gulf passive margin over the Late Cretaceous eustacy has played a major role in depositional sequence development and thereby promoted a consistent and relatively predictable pattern in the paleogeographic distribution among a restricted number of depositional facies. In the study area, thirteen constituent depositional sequences are recognized. Analysis of their individual paleogeography and the facies relations within depositional sequences (both highstand systems tracts and transgressive systems tracts) permits successful prediction of intrasequence primary permeability (i.e., confined aquifer) distribution.

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