Early Cretaceous Carbonate Platform, North Rim of the Gulf of Mexico, Mississippi and Louisiana
D. A. Yurewicz, T. Β. Marler, K. Α. Meyerholtz, F. X. Siroky, 1993. "Early Cretaceous Carbonate Platform, North Rim of the Gulf of Mexico, Mississippi and Louisiana", Cretaceous Carbonate Platforms, J. A. Toni Simo, Robert W. Scott, Jean-Pierre Masse
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Name: Gulf of Mexico, north rim
Authors: D. A. Yurewicz, T. B. Marler, K. A. Meyerholtz, and F. X. Siroky
Location: From 30° to 33° north latitude and 89° to 94° west longitude, Mississippi and Louisiana
Geologic time interval: Early Cretaceous (Barremian) to early Late Cretaceous (early Cenomanian)
Tectonic-sedimentary setting: Passive continental margin, shallow marine to coastal plain
Basin type: Passive continental margin on the north rim of the Gulf of Mexico
Platform type: Rimmed
Platform geometry: Lower Cretaceous section in Louisiana and Mississippi is approximately 2000 m thick. The platform represents a 1400-km-long segment of the north rim of the ancestral Gulf of Mexico that varied in width from about 75 to 200 km (shoreline to basin margin).
Facies and fossils: Rimmed platform with (1) a broad, restricted, shallow marine platform interior or lagoon; (2) a narrow, well-circulated, shallow marine outer platform; (3) a well-defined platform margin; and (4) a gradually dipping foreslope. Fossils: rudists, corals, stromatoporoids, stromatolites, bivalves, gastropods, echinoderms, foraminifera (miliolids and orbitolinids), and red and green calcareous algae
Systems tracts: Eight third-order sequences exist between the Lower Cretaceous Sligo and lower Upper Cretaceous Washita Formations. Each represents a separate platform complex separated by a basinally restricted lowstand wedge and/or a thin sheet of transgressive shale or siliciclastic sandstone. Most of the carbonate section represents highstand deposition.
Stacking patterns: Eight stacked platform complexes; platform growth was generally aggradational except in the lower Albian Lower Glen Rose sequence, which is more progradational.