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 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 quilombensis |
Laje do Coringa, Cajual Island |
Cenomanian |
Fused premaxillae; isolated and incomplete left maxilla |
| ||
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.
- ^ 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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