Coordinates: 2°30′S 44°30′W / 2.5°S 44.5°W / -2.5; -44.5

Alcântara Formation

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Alcântara Formation
Stratigraphic range: Cenomanian
TypeGeological formation
Unit ofItapecuru Group
UnderliesCujupe Formation
OverliesUndifferentiated unit
Thickness30–35 m (98–115 ft)
Lithology
PrimarySandstone
OtherClaystone, conglomerate
Location
CoordinatesLua error in Module:Coordinates at line 489: attempt to index field 'wikibase' (a nil value).
Approximate paleocoordinatesLua error: callParserFunction: function "#coordinates" was not found.
RegionMaranhão
CountryBrazil
ExtentSão Luís-Grajaú Basin
Type section
Named forAlcântara (city)
Named byRossetti & Truckenbrodt
Year defined1997
Alcântara Formation is located in Brazil
Alcântara Formation
Alcântara Formation (Brazil)

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

Fossil content

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Color key
Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Dinosaurs

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Ornithischians

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Ornithischians of the Alcântara Formation
Genus Species Location Stratigraphic position Material Notes Image
Ornithopoda indet. Indeterminate Laje do Coringa, Cajual Island Footprints [2] Footprints interpreted as coming from both small and large ornithopods. Larger footprints have been tentatively assigned to hadrosaurs.

Sauropods

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Sauropods of the Alcântara Formation
Genus Species Location Stratigraphic position Material Notes Images
Itapeuasaurus[3] I. cajapioensis Itapeua beach A rebbachisaurid sauropod
cf. Limaysaurus[4] L. tessonei Laje do Coringa, Cajual Island Vertebrae A rebbachisaurid sauropod
cf. Malawisaurus?[5][6] M. sp. Laje do Coringa, Cajual Island Tooth A tooth similar to Malawisaurus
Sauropoda indet.[6] Indeterminate Laje do Coringa, Cajual Island Teeth May belong to a titanosaurian or a diplodocoid rebbachisaurid
Titanosauria indet.[6] Indeterminate Laje do Coringa, Cajual Island Vertebrae and an osteoderm A titanosaurian sauropod


Theropods

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Theropods of the Alcântara Formation
Genus Species Location Stratigraphic position Material Notes Images
Abelisauridae indet.[7] Indeterminate Laje do Coringa, Cajual Island Two shed tooth crowns A abelisaurid theropod
Carcharodontosauridae indet.[8] Indeterminate Laje do Coringa, Cajual Island Teeth A carcharodontosaurid theropod
Dromaeosauridae indet.[6] Indeterminate Laje do Coringa, Cajual Island Teeth Possible member of Velociraptorinae
Noasauridae indet.[9] Indeterminate Laje do Coringa, Cajual Island Nine teeth A noasaurid theropod; closely related to Masiakasaurus.
Oxalaia[10] O. quilombensis Laje do Coringa, Cajual Island Fused premaxillae; isolated and incomplete left maxilla (both heavily damaged from the National Museum of Brazil fire) A spinosaurid theropod which may be synonymus with Spinosaurus itself.[11] However, this has been disputed.[12] File:Oxalaia quilombensis life reconstruction by PaleoGeek.png

Sigilmassasaurus[6]

S. brevicollis

Laje do Coringa, Cajual Island Two caudal vertebrae

Referral to Sigilmassasaurus was based on similarity to presumed caudal vertebrae of the genus from the Kem Kem Group. However, the 2022 study noted that these specimens are indeterminate spinosaurids, most likely belonging to Oxalaia considering the geographical and geological context.[13]

Spinosauridae indet.[14] Indeterminate Laje do Coringa, Cajual Island Teeth A spinosaurid theropod different from Oxalaia.
Unenlagiinae[15] Indeterminate Laje do Coringa, Cajual Island, São Luís-Grajaú Basin Teeth A dromaeosaurid theropod

Pterosauria

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Pterosaurs of the Alcântara Formation
Genus Species Location Stratigraphic position Material Notes Images
Anhangueridae indet.[6] Indeterminate Laje do Coringa, Cajual Island Teeth A anhanguerid pterosaur

Crocodylomorphs

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Crocodylomorphs of the Alcântara Formation
Genus Species Location Stratigraphic position Material Notes Images
Candidodon[6] C. itapecuruense Laje do Coringa, Cajual Island Teeth A notosuchian
Coringasuchus[16] C. anisodontis Laje do Coringa, Cajual Island Partial right dentary A notosuchian

Turtles

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Turtles of the Alcântara Formation
Genus Species Location Stratigraphic position Material Notes Images
Pelomedusoides indet.[6] Indeterminate Laje do Coringa, Cajual Island Incomplete carapace

Squamates

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Squamates of the Alcântara Formation
Genus Species Location Stratigraphic position Material Notes Images
Seismophis[17] S. septentrionalis Laje do Coringa, Cajual Island Vertebrae A snake

Mosasaurs

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Mosasaurs of the Alcântara Formation
Genus Species Location Stratigraphic position Material Notes Images
Carinodens[6] C. fraasi Laje do Coringa, Cajual Island Dental A globidensin mosasaurine File:Carinodens fraasi.jpg

Fish

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Fishes of the Alcântara Formation
Genus Species Location Stratigraphic position Material Notes Images
Adrianaichthys[18] A. pankowski Laje do Coringa, Cajual Island Scales A lepisosteiform fish
Aegyptobatus[19] A. kuehnei Laje de Coringa, Cajual Island A distobatid hybodont
Arganodus[6] A. tiguidiensis Laje do Coringa, Cajual Island Dental plates A ceratodontid lungfish File:Chinle fish Arganodus cropped.png
Atlanticopristis[20] A. equatorialis Falésia do Sismito and Laje do Coringa, Cajual Island Fourteen denticle specimens (two complete) A sclerorhynchoid File:Atlanticopristis by PaleoGeek.png
Bartschichthys[6] B. sp. Laje do Coringa, Cajual Island Spines A cladistian
Ceratodus[6] C. brasiliensis Laje do Coringa, Cajual Island Dental plates A ceratodontid lungfish File:Ceratodus.jpg
C. humei
Equinoxiodus[6] E. alcantarensis[21] Laje do Coringa, Cajual Island One complete and eight incomplete tooth plates A neoceatodontid lungfish
E. schuitzei[22]
Lepidotes[6] L. sp. Laje do Coringa, Cajual Island Mineralized scales A lepidotid fish.
Lepisosteidae Indet.[23] Indeterminate Laje do Coringa, Cajual Island Scales
Mawsonia[24] M. gigas Laje do Coringa, Cajual Island Palato-quadrate and post-parietal cranial material A mawsoniid coelacanth. File:Mawsonia sp.jpg
Myliobatis[6] M. dixoni Laje do Coringa, Cajual Island A myliobatid eagle ray
Obaichthys[6] O. africanus Laje do Coringa, Cajual Island Scales A obaichthyid lepisosteiform
Onchopristis cf. O. numida[25] Laje do Coringa, Cajual Island Rostral teeth A sclerorhynchoid File:Onchopristis numida.png
Pycnodontiformes indet.[6] Indeterminate Laje do Coringa, Cajual Island Dental plate and teeth
Stephanodus[6] S. sp. Laje do Coringa, Cajual Island Pharyngeal teeth A pycnodontid fish
Tribodus[6] T. limae Laje do Coringa, Cajual Island Dorsal spines A hybodont shark

References

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  24. ^ 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.
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