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
Region	Maranhão
Country	South America
Type section
Named for	Alcântara (city)
Named by	Rossetti & Truckenbrodt (1997)

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

Vertebrate paleofauna

Fishes

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 sclerorhynchoid
Mawsonia[4]	Mawsonia gigas	Laje do Coringa, Cajual Island	Early Cenomanian		A coelacanthiform

Crurotarsans

Crocodylomorphs
Genus	Species	Location	Stratigraphic position	Material	Notes	Images
Coringasuchus[5]	Coringasuchus anisodontis	Laje do Coringa, Cajual Island	Early Cenomanian	Partial right lower jaw (dentary)	Possible a notosuchian.

Ornithodirans

Dinosaurs
Genus	Species	Location	Stratigraphic position	Material	Notes	Images
Oxalaia[6]	Oxalaia quilombensis	Laje do Coringa, Cajual Island	Cenomanian	Fused premaxillae; isolated and incomplete left maxilla	A spinosaurid

References

1. 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.
2. 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. doi:10.1590/s0001-37652011000400006.
3. 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. doi:10.4072/rbp.2008.3.07.
4. Medeiros, M.A., Carvalho, M.S.S., Silva, M.A.M., Pereira, A.A., Araujo, M.N., Ferreira, N.N., Vilas Bôas, I., 2011. O senhor dos rios: Mawsonia gigas (Mawsoniidae) do Cenomaniano do Maranhão, Brasil. In: Carvalho, I.S., Srivastava, N.K., Strohschoen, J.O., Lana, C.C. (Eds.), Paleontologia: Cenários de Vida, Vol. 4. Interciência, Rio de Janeiro, pp. 575-583.
5. Kellner, A.W.A.; Pinheiro, A.E.P.; Azevedo, S.A.K.; Henriques, D.D.R.; de Carvalho, L.B.; Oliveira, G.R. (2009). "A new crocodyliform from the Alcântara Formation (Cenomanian), Cajual Island, Brazil". Zootaxa. 2030: 49–58.
6. Kellner, Alexander W.A.; Azevedeo, Sergio A.K.; Machado, Elaine B.; Carvalho, Luciana B.; Henriques, Deise D.R. (2011). "A new dinosaur (Theropoda, Spinosauridae) from the Cretaceous (Cenomanian) Alcântara Formation, Cajual Island, Brazil" (PDF). Anais da Academia Brasileira de Ciências. 83 (1): 99–108. doi:10.1590/S0001-37652011000100006. ISSN 0001-3765.