Bahia Group

Bahia Group
Stratigraphic range: Valanginian-Hauterivian
TypeGroup
Sub-unitsMarfim Formation
Lithology
PrimaryConglomerate
Location
Coordinates12°54′S 38°30′W / 12.9°S 38.5°W / -12.9; -38.5
Approximate paleocoordinates12°42′S 5°42′W / 12.7°S 5.7°W / -12.7; -5.7
RegionBahia
CountryBrazil
ExtentRecôncavo Basin
Type section
Named forBahia
Bahia Group (Brazil)

The Bahia Group, also known as Bahia Series, is an Early Cretaceous geologic group of the Recôncavo Basin in Bahia, Brazil dating back to the Valanginian and Hauterivian. Dinosaur remains are among the fossils that have been recovered from unit, including those of the ornithopod Tietasaura from the Marfim Formation.[1][2] The conglomerates were deposited in an estuarine environment.[3]

Fossil content

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.

Ornithopods

Ornithopods of the Bahia Group
Genus Species Location Stratigraphic position Material Notes Images
Iguanodontia Indet. Indeterminate
Tietasaura T. derbyiana A elasmarian ornithopod

Sauropods

Sauropods of the Bahia Group
Genus Species Location Stratigraphic position Material Notes Images
Diplodocidae Indet. Indeterminate
Lithostrotia Indet. Indeterminate

Theropods

Theropods of the Bahia Group
Genus Species Location Stratigraphic position Material Notes Images
Carcharodontosauria Indet. Indeterminate
Spinosauridae Indet. Indeterminate
Tyrannosauroidea? Indet. Indeterminate

Pterosaurs

Pterosaurs of the Bahia Group
Genus Species Location Stratigraphic position Material Notes Images
Anhangueridae Indet. Indeterminate

Crocodylomorphs

Crocodylomorphs of the Bahia Group
Genus Species Location Stratigraphic position Material Notes Images
Sarcosuchus[4] S. hartti A pholidosaurid crocodyliform
"Thoracosaurus" "T. bahiensis" A gavialoid crocodilian

Turtles

Turtles of the Bahia Group
Genus Species Location Stratigraphic position Material Notes Images
Testudines Indet. Indeterminate

Fish

Fishes of the Bahia Group
Genus Species Location Stratigraphic position Material Notes Images
Acrodus A. nitidus A acrodontid hybodont
"Belonostomus" "B". carinatus A aspidorhynchid fish
Calamopleurus C. mawsoni A amiid fish
Ellimmichthys E. longicostatum A ellimmichthyiform fish
E. spinosus
Lepidotes L. spp. A lepidotid fish
Mawsonia M. gigas A mawsoniid coelacanth
Scrombroclupeoides S. scutata A clupeomorph fish
Scutatuspinosus S. itapagipensis A ellimmichthyiform fish

Molluscs

Bivalves

Bivalves of the Bahia Group
Genus Species Location Stratigraphic position Material Notes Images
Anhapoa[5] A. munizi A iridinid bivalve
Duplexium[5] D. jatobensis A iridinid bivalve

See also

References

  1. ^ Bandeira, Kamila L. N.; Navarro, Bruno A.; Pêgas, Rodrigo V.; Brilhante, Natan S.; Brum, Arthur S.; de Souza, Lucy G.; de Silva, Rafael C.; Gallo, Valéria (2024). "A reassessment of the historical fossil findings from Bahia State (Northeast Brazil) reveals a diversified dinosaur fauna in the Lower Cretaceous of South America". Historical Biology: 1–42. doi:10.1080/08912963.2024.2318406.
  2. ^ Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.
  3. ^ Pedra Furada Bay at Fossilworks.org
  4. ^ Souza, Rafael G; Figueiredo, Rodrigo G; Azevedo, Sérgio A K; Riff, Douglas; Kellner, Alexander W A (August 12, 2019). "Systematic revision of Sarcosuchus hartti (Crocodyliformes) from the Recôncavo Basin (Early Cretaceous) of Bahia, north-eastern Brazil". Zoological Journal of the Linnean Society: zlz057. doi:10.1093/zoolinnean/zlz057. ISSN 0024-4082.
  5. ^ a b Baumann, D. E.; Simone, L. R. L.; Silva, R. C.; Ghilardi, R. P. (2025). "The Oldest Record of the Family Iridinidae (Unionida): New Fossil Genera and Species of Bivalves from the Salvador Formation (Berriasian), Jatobá Basin, Northeastern Brazil". Journal of South American Earth Sciences. 105587. doi:10.1016/j.jsames.2025.105587.

Bibliography

Further reading

  • J. Mawson and A. S. Woodward. 1907. On the Cretaceous formation of Bahia (Brazil), and on vertebrate fossils collected therein. Quarterly Journal of the Geological Society of London 63:128-139
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