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The AAPG/Datapages Combined Publications Database

GCAGS Transactions

Abstract


Gulf Coast Association of Geological Societies Transactions
Vol. 40 (1990), Pages 381-387

Facies Stratigraphy and Relative Sea-Level History -- Upper Cretaceous Eutaw Formation, Central and Eastern Alabama

David T. King, Jr. (1)

ABSTRACT

The Eutaw Formation (130 to 400 ft thick) rests disconformably on incised valleys (a type 1 unconformity) occuring at the top of the underlying non-marine Tuscaloosa Formation (Cenomanian-early Turonian). The Eutaw is topped by an erosional discontinuity which has slight relief and a discontinuous conglomeratic lag. In the outcrop and shallow subsurface, the Eutaw Formation has four main paralic and nearshore facies which are arranged in two discontinuity-bounded genetic packages of facies (or parasequences) both of which developed in a single eustatic cycle. The Eutaw facies are: carbonaceous and ostried-rich clayey silts (back barrier); planar, trough, and low-angle cross-bedded medium-fine sands (barrier island); fossiliferous bioturbated fine sands (lower shoreface); and calcareous clays, silts, and sands (inner shelf). The intraformational facies discontinuity is likely a parasequence boundary developed at maximum eustatic high stand in latest Santonian.


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