Upper Aptian–Lower Coniacian Carbonate Sequences in the Sergipe Basin, Northeastern Brazil
Eduardo A. M. Koutsoukos, Nivaldo Destro, Nilo C. de Azambuja Filho, Adali Ricardo Spadini, 1993. "Upper Aptian–Lower Coniacian Carbonate Sequences in the Sergipe Basin, Northeastern Brazil", Cretaceous Carbonate Platforms, J. A. Toni Simo, Robert W. Scott, Jean-Pierre Masse
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Name: Riachuelo and Continguiba carbonate systems, Sergipe basin
Authors: Eduardo A. M. Koutsoukos, Nivaldo Destro, Nilo C. de Azambuja Filho, and Adali Ricardo Spadini
Location: From 9° to 11 ° 30' south latitude and 35° 30' to 37° west longitude, Sergipe, northeastern Brazil
Geologic time interval: Middle Cretaceous, late Aptian–early Coniacian (Epicheloniceras sp-Diadochoceras sp.–Eodouvilleiceras sp. zone to the Solgerites armatus–Prionocycloceras lenti zone)
Tectonic-sedimentary setting: Formed by a series of half-grabens with a regional dip averaging 10–15° to the southeast, resulting from normal faults arranged in a northeast-southwest direction
Basin type: Atlantic-type passive marginal basin
Paleoclimate: Dominantly dry, semi-arid, tropical
Platform types: Mixed carbonate–siliciclastic system (late Aptian-Albian Riachuelo Fm.) and carbonate ramp system (Cenomanian–early Coniacian Cotinguiba Fm.)
Platform geometry: Riachuelo carbonate system: average thickness of 500 m, but locally attains a maximum of 1700 m; about 20 km wide and 115 km long onshore. Cotinguiba carbonate system: thickness ranging from 200 m to over 1000 m locally in the onshore part; about 5–10 km wide and 200 km long onshore.
Facies and fossils: Riachuelo Fm: oncolitic–oolitic–bioclastic packstone–grainstone; fine-grained limestone, marlstone, and shale; conglomerate, sandstone, and siltstone. Ammonites, planktonic and benthonic foraminifera, ostracods, radiolarians, algae, bivalves, brachipods, gastropods, serpulids, crustaceans, corals, echinoderms, and fishes. Cotinguiba Fm: rhythmic fine-grained carbonate mudstone, marlstone, shale, and wackestone breccia. Ammonites, nautiloids, planktonic and benthonic foraminifera, ostracods, radiolarians, diatoms, calcispheres, siliceous sponge spicules, bivalves, brachipods, gastropods, serpulids, crustaceans, cirripeds, corals, bryozoans, echinoderms, fishes, and reptiles.
Systems tracts: lagoonal, neritic, upper bathyal, basin
Stacking patterns: Not determined