Abstract
Stratigraphic sections of the Bisbee Group in northwestern Mexico have been studied. Several lithostratigraphic units from the Cerro de Oro and Lampazos areas, characterized by mainly carbonate/clastic shallow water sequences, are discussed in this paper. In the Lampazos area these sediments are grouped into the Agua Salada, Lampazos, Espinazo del Diablo, and Nogal Formations. In the Lower Cretaceous sections of the Cerro de Oro area, the Cerro de Oro, Morita, and Cintura Formations, as well as the Mural Limestone are distinguished. Scleractinian corals are reported from Upper Barremian to Middle Albian reefal limestone intervals within the Cerro de Oro, Espinazo del Diablo and Nogal Formations, and within sequences of the Mural Limestone. They comprise 32 genera belonging to seven suborders. Six new species are described: Columastrea paucipaliformis n. sp., Columnocoenia minima n. sp., Keriophyllia roniewiczae n. sp., Cladophyllia mexicana n. sp., Pleurostylina major n. sp., and Stiboriopsis sonoraensis n. sp.
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