Early Cretaceous Carbonate Platforms of Northeastern and East-Central Mexico
J. L. Wilson, W. C. Ward, 1993. "Early Cretaceous Carbonate Platforms of Northeastern and East-Central Mexico", Cretaceous Carbonate Platforms, J. A. Toni Simo, Robert W. Scott, Jean-Pierre Masse
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Names: Cupido and Aurora around Coahuila block, Golden Lane (Tuxpan), and Valles–San Luis Potosí platforms
Authors: J. L. Wilson and W. C. Ward
Location: From 96° to 102° west longitude and 20° to 28° north latitude, northeastern and east-central Mexico
Geologic time interval: Two periods of platform development: Neocomian–Aptian and
Albian-Cenomanian, separated by a transgressive shale
Tectonic-sedimentary setting: Rifted and dissected passive margin
Basin type: Marginal cratonic
Paleoclimate: Semitropical, generally humid but with two semi-arid periods in early Aptian and middle Albian
Platform type: Rimmed shelves around major positive basement blocks and isolated platforms developed over positive blocks
Platform geometry: Thickness of a few hundred meters to 2000 m. Rimmed shelves as much as 80 km wide and hundreds of km long. Isolated platforms are 65 by 145 km and 200 by 300 km
Facies and fossils: Multitextured carbonates, minor amounts of terrigenous clastics. Both extensive pelagic biotas and shallow water benthos of foraminifers, algae, corals, and various molluscs, particularly rudists.
Systems tracts: Sabkha evaporites, intertidal carbonate cycles, grainstone shoals, coarse rudist–coral–sponge–hydrozoan–red algae at shelf margin, lithoclastic debris, pelagic rhythmites in basin. Mostly highstand systems tracts leading into starved basins. Only minor lowstand systems tracts.
Stacking patterns: Progradations of simple sigmoid sequences, some rising in the sequence as they prograde (Barremian–Aptian). Some of the Albian-Cenomanian platforms are predominantly aggradational, although progradational sequences are documented on the southeastern margin of the Valles platform and the southern flank of the Coahuila block.