Alcântara Formation

Alcântara Formation Stratigraphic range: Upper Cretaceous (Cenomanian)
Type	Geological formation
Unit of	São Luís Basin (Itapecuru Group)
Underlies	Cujupe Formation
Overlies	Undifferentiated Unit
Thickness	30-35 m
Lithology
Primary	sandstone
Other	argillite, carbonate
Location
Named for	Alcântara (city)
Named by	Rossetti & Truckenbrodt (1997)
Region	Maranhão
Country	Brazil

The Alcântara Formation is a geological formation in northeastern Brazil whose strata date back to the Upper Cretaceous.^[1]

Vertebrate paleofauna

Fishes
Genus	Species	Location	Stratigraphic position	Material	Notes	Images
Equinoxiodus^[2]	Equinoxiodus alcantarensis	Laje do Coringa, Cajual Island	Early Cenomanian	1 complete and 8 incomplete tooth plates	A dipnoiform
Atlanticopristis^[3]	Atlanticopristis equatorialis	Falésia do Sismito, Cajual Island	Early Cenomanian	14 specimens (two complets)	A sclerorhynchid

Crocodylomorphs
Genus	Species	Location	Stratigraphic position	Material	Notes	Images
Coringasuchus^[4]	Coringasuchus anisodontis	Laje do Coringa, Cajual Island	Early Cenomanian	Partial right lower jaw (dentary)	Possible a notosuchian.

Dinosaurs
Genus	Species	Location	Stratigraphic position	Material	Notes	Images
Oxalaia^[5]	Oxalaia quilombensis	Laje do Coringa, Cajual Island	Cenomanian	Fused premaxillae; isolated and incomplete left maxilla	A spinosaurid

^ Rossetti, D.F.; Truckenbrodt, W. (1997). "Revisão estratigráfica para os depósitos do Albiano-Terciário Inferior (?) na Bacia de São Luís (MA), Norte do Brasil". Boletim do Museu Paraense Emílio Goeldi 9: 29–41.
^ Toledo, C.E.; Sousa, E.P.; Medeiros, M.A.; Bertini, R.J. (2011). "A new genus of dipnoiformes from the Cretaceous of Brazil". Anais da Academia Brasileira de Ciências 83 (4): 1181-1192.
^ Pereira, A.A.; Medeiros, M.A. (2008). "A new sclerorhynchiform (Elasmobranchii) from the middle Cretaceous of Brazil". Revista Brasileira de Paleontologia 11 (3): 207– 212.
^ Kellner, A.W.A.; Pinheiro, A.E.P.; Azevedo, S.A.K.; Henriques, D.D.R.; de Carvalho, L.B.; and Oliveira, G.R. (2009). "A new crocodyliform from the Alcântara Formation (Cenomanian), Cajual Island, Brazil". Zootaxa 2030: 49–58.
^ Kellner, Alexander W.A.; Sergio A.K. Azevedeo, Elaine B. Machado, Luciana B. Carvalho and Deise D.R. Henriques (2011). "A new dinosaur (Theropoda, Spinosauridae) from the Cretaceous (Cenomanian) Alcântara Formation, Cajual Island, Brazil". Anais da Academia Brasileira de Ciências 83 (1): 99–108. doi:10.1590/S0001-37652011000100006. ISSN 0001-3765. http://www.scielo.br/pdf/aabc/v83n1/v83n1a06.pdf.