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The AAPG/Datapages Combined Publications Database

GCAGS Transactions

Abstract


Gulf Coast Association of Geological Societies Transactions
Vol. 33 (1983), Pages 163-167

Cotton Valley Depositional Systems of Mississippi

Tim Moore (1)

ABSTRACT

The Jurassic Cotton Valley Group in Mississippi is generally considered to be one formation, roughly equivalent to the Schuler Formation of Louisiana. Gross changes in lithology and electric log characteristics are observed across the state of Mississippi. These lateral variations are best discussed in terms of the depositional systems operant during Cotton Valley time. Through the use of sand percentage and sand isolith maps, various depositional systems can be discerned.

Two delta systems existed in Mississippi; a constructive delta in the west-central portion of the state, and a destructive delta in the east-central portion. An interdeltaic system in central Mississippi, between the two delta systems, was possibly bounded on the south by a barrier bar system. Elevation above wave base, caused by the positive influence of the Wiggins Arch and Hancock County High, resulted in the development of a strandplain system in southeast Mississippi. Lack of well control precludes a definitive statement about depositional environment in the southwest portion of the state. By geographic relationship to the other depositional systems, a shelf system is inferred.

Recognition of the Cotton Valley depositional systems in Mississippi aids in identifying potentially productive trends which have yet to be adequately explored.


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