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The AAPG/Datapages Combined Publications Database
GCAGS Transactions
Abstract
Stratigraphic Relationships of the Annona Chalk and Gober Chalk (Upper Campanian) Type Localities in Northeast Texas and Southwest Arkansas
Laird B. Thompson, (1) Stephen F. Percival (1), Judith A. Patricelli (1)
ABSTRACT
The age and stratigraphic relationships of the Annona and Gober chalks (Upper Cretaceous) in northeast Texas and southwest Arkansas have been points of controversy for fifty years. Analyses of planktonic foraminiferal faunas, nannoplankton floras, and dinoflagellate and pollen floras indicate an age of early late Campanian (Pseudotextularia elegans Zonule of Pessagno) for the type Gober Chalk, and latest Campanian (Globotruncana calcarata Zonule of Pessagno) for the Annona Chalk. Petrographic and scanning electron microscopic analyses of both chalks indicate that these strata were deposited under different conditions and have different diagenetic histories. Paleoenvironmental data derived from the benthonic foraminiferal faunas and the dinoflagellates suggest that the Annona Chalk was deposited in an inner to middle neritic environment and that the Gober Chalk was laid down under outer neritic conditions.
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