Alcântara Formation

Alcântara Formation
Stratigraphic range: Cenomanian
Type Geological formation
Unit of Itapecuru Group, São Luís Basin
Underlies Cujupe Formation
Overlies Undifferentiated Unit
Thickness 30–35 m (98–115 ft)
Lithology
Primary Sandstone
Other Claystone, carbonate
Location
Region  Maranhão
Country  Brazil
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
Equinoxiodus Equinoxiodus alcantarensis Laje do Coringa, Cajual Island Early Cenomanian A dipnoiform: 1 complete and 8 incomplete tooth plates [2]
Atlanticopristis Atlanticopristis equatorialis Falésia do Sismito, Cajual Island Early Cenomanian A sclerorhynchoid: 14 specimens (two complete) [3]
Mawsonia Mawsonia gigas Laje do Coringa, Cajual Island Early Cenomanian A coelacanthiform [4]

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. ISSN 0001-3765. doi:10.1590/S0001-37652011000100006.
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