Alcântara Formation

Alcântara Formation
Stratigraphic range: Cenomanian
Alcântara Formation; Stratigraphic range: Cenomanian
Type	Geological formation
Unit of	Itapecuru Group
Underlies	Cujupe Formation
Overlies	Undifferentiated unit
Thickness	30–35 m (98–115 ft)
Lithology
Primary	Sandstone
Other	Claystone, conglomerate
Location
Coordinates	2°30′S 44°30′W / 2.5°S 44.5°WCoordinates: 2°30′S 44°30′W / 2.5°S 44.5°W
Approximate paleocoordinates	9°24′S 19°18′W / 9.4°S 19.3°W
Region	Maranhão
Country	Brazil
Extent	São Luís-Grajaú Basin
Type section
Named for	Alcântara (city)
Named by	Rossetti & Truckenbrodt
Year defined	1997

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

Vertebrate paleofauna

Fish

Fishes
Genus	Species	Location	Stratigraphic position	Material	Notes	Images
Equinoxiodus	E. alcantarensis	Laje do Coringa, Cajual Island	Early Cenomanian	A dipnoiform: 1 complete and 8 incomplete tooth plates	^[2]
Atlanticopristis	A. equatorialis	Falésia do Sismito, Cajual Island	Early Cenomanian	A sclerorhynchoid: 14 specimens (two complete)	^[3]
Mawsonia	M. gigas	Laje do Coringa, Cajual Island	Early Cenomanian	A coelacanthiform	^[4]

Crurotarsans

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

Squamates

Snakes
Genus	Species	Location	Stratigraphic position	Material	Notes	Images
Seismophis^[6]	S. septentrionalis	Laje do Coringa, Cajual Island	Cenomanian	vertebrae	A snake

Dinosaurs

Dinosaurs
Genus	Species	Location	Stratigraphic position	Material	Notes	Images
Oxalaia^[7]	O. quilombensis	Laje do Coringa, Cajual Island	Cenomanian	Fused premaxillae; isolated and incomplete left maxilla	A spinosaurid

References

↑ 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. doi:10.1590/s0001-37652011000400006.
↑ 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.
↑ 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.
↑ 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.
↑ Hsiou, A. S.; Albino, A. M.; Medeiros, M. A.; Santos, R. A. B. (2013). "The oldest Brazilian snakes from the early Late Cretaceous (Cenomanian)". Acta Palaeontologica Polonica. 59 (3): 635–642. doi:10.4202/app.2012.0091.
↑ 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.

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[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.

[AWAKetal09-5] 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] Hsiou, A. S.; Albino, A. M.; Medeiros, M. A.; Santos, R. A. B. (2013). "The oldest Brazilian snakes from the early Late Cretaceous (Cenomanian)". Acta Palaeontologica Polonica. 59 (3): 635–642. doi:10.4202/app.2012.0091.

[Oxalaia-7] 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.