Alcântara Formation
Alcântara Formation | ||
---|---|---|
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 Cenomanian of the Late Cretaceous.[1]
Fossil content
Dinosaurs
Dinosaurs | ||||||
---|---|---|---|---|---|---|
Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
Carcharodontosauridae indet.[2] | Indeterminate | Laje do Coringa, Cajual Island | Early Cenomanian | Teeth | ||
Dromaeosauridae indet.[3] | Indeterminate | Laje do Coringa, Cajual Island | Early Cenomanian | Teeth | Possible member of Velociraptorinae | |
Itapeuasaurus[4] | I. cajapioensis | Itapeua beach | Early Cenomanian | A rebbachisaurid | ||
cf. Limaysaurus[5] | L. tessonei | Laje do Coringa, Cajual Island | Early Cenomanian | Vertebrae | ||
Malawisaurus[6] | M. sp. | Laje do Coringa, Cajual Island | Early Cenomanian | Tooth | ||
Noasauridae indet. [7] | Indeterminate | Laje do Coringa, Cajual Island | Early Cenomanian | Nine teeth | Teeth belong to an animal closely related to Masiakasaurus knopfleri. | |
Oxalaia[8] | O. quilombensis | Laje do Coringa, Cajual Island | Early Cenomanian | Fused premaxillae; isolated and incomplete left maxilla | A spinosaurid
|
|
Sauropoda indet.[3] | Indeterminate | Laje do Coringa, Cajual Island | Early Cenomanian | Teeth | May belong to a titanosaurid or a diplodocoid rebbachisaurid | |
S. brevicollis |
Laje do Coringa, Cajual Island | Early Cenomanian | Two caudal vertebrae |
Referral to Sigilmassasaurus was based on similarity to presumed caudal vertebrae of the genus from the Kem Kem Group. However, these caudal vertebrae have since been separated from the genus, meaning that it is currently impossible to refer any caudal vertebrae to it. |
||
Spinosauridae indet.[9] | Indeterminate | Laje do Coringa, Cajual Island | Early Cenomanian | Teeth | A spinosaurid different from Oxalaia. | |
Theropoda indet.[3] | Indeterminate | Laje do Coringa, Cajual Island | Early Cenomanian | Claw | ||
Titanosauria indet.[3] | Indeterminate | Laje do Coringa, Cajual Island | Early Cenomanian | Vertebrae | ||
Titanosauria indet.[3] | Indeterminate | Laje do Coringa, Cajual Island | Early Cenomanian | Osteoderm | ||
cf. Unenlagiinae[10] | Indeterminate | Laje do Coringa, Cajual Island, São Luís-Grajaú Basin | Early Cenomanian | Teeth |
Pterosauria
Pterosaurs | ||||||
---|---|---|---|---|---|---|
Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
Anhangueridae indet.[3] | Indeterminate | Laje do Coringa, Cajual Island | Early Cenomanina | Teeth |
Crocodylomorphs
Crocodylomorphs | ||||||
---|---|---|---|---|---|---|
Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
Crocodylomorpha indet.[3] | Indeterminate | Laje do Coringa, Cajual Island | Early Cenomanian | Teeth and osteoderms | ||
Coringasuchus[11] | C. anisodontis | Laje do Coringa, Cajual Island | Early Cenomanian | Partial right lower jaw (dentary) | Possibly a notosuchian |
Turtles
Crocodylomorphs | ||||||
---|---|---|---|---|---|---|
Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
Pelomedusoides indet.[3]
|
Indeterminate | Laje do Coringa, Cajual Island | Early Cenomanian | Incomplete carapace |
Squamates
Snakes | ||||||
---|---|---|---|---|---|---|
Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
Seismophis[12] | S. septentrionalis | Laje do Coringa, Cajual Island | Early Cenomanian | Vertebrae | A snake |
Fish
Fishes | ||||||
---|---|---|---|---|---|---|
Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
Arganodus[3] | A. tiguidiensis | Laje do Coringa, Cajual Island | Early Cenomanian | Dental plates | A ceratodontid lungfish | |
Atlanticopristis[13] | A. equatorialis | Falésia do Sismito and Laje do Coringa, Cajual Island | Early Cenomanian | Fourteen denticle specimens (two complete) | A sclerorhynchid
|
|
Bartschichthys[3] | B. sp. | Laje do Coringa, Cajual Island | Early Cenomanian | Spines | ||
Ceratodus[3]
|
C. brasiliensis C. humei |
Laje do Coringa, Cajual Island | Early Cenomanian | Dental plates | A ceratodontid lungfish | |
Equinoxiodus[14] | E. alcantarensis E. sp.[3] |
Laje do Coringa, Cajual Island | Early Cenomanian | One complete and eight incomplete tooth plates | A dipnoiform | |
Lepidotes[3] | Lepidotes sp. | Laje do Coringa, Cajual Island | Early Cenomanian | Mineralized scales | ||
Mawsonia[15] | M. gigas | Laje do Coringa, Cajual Island | Early Cenomanian | Palato-quadrate and post-parietal cranial material | A coelacanthiform
|
|
Myliobatis[3] | M. sp. | Laje do Coringa, Cajual Island | Early Cenomanian | |||
Onchopristis[3] | O. cf. numidus | Laje do Coringa, Cajual Island | Early Cenomanian | Rostral teeth | A sclerorhynchoid. | |
Pycnodontiformes indet.[3] | Indeterminate | Laje do Coringa, Cajual Island | Early Cenomanian | Dental plate and teeth | ||
Stephanodus[3] | S. sp. | Laje do Coringa, Cajual Island | Early Cenomanian | Pharyngeal teeth | ||
Tribodus[3] | T. cf. limae | Laje do Coringa, Cajual Island | Early Cenomanian | Dorsal spines | A hybodont |
Color key
|
Notes Uncertain or tentative taxa are in small text; |
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.
- ^ Candeiro, C.R.A.; Martinelli, Agustin G. (2005). "Abelisauroidea and Carcharodontosauridae (Theropoda, Dinosauria) in the Cretaceous of South America. Paleogeographical and geocronological implications". Sociedade & Natureza. 17 (33).
- ^ .
- S2CID 201321631.
- .
- ^ Freire, Pedro Carvalho; Medeiros, Manuel Alfredo; Lindoso, Rafael Matos (2007). "Sauropod teeth diversity in the Laje do Coringa fossiliferous site, Eocenomanian of Northeastern Brazil". Paleontologia: Cenários de Vida: 523–532.
- .
- PMID 21437377.
- .
- .
- S2CID 88042701.
- .
- .
- PMID 22146953.
- ^ 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.