Earth:Bahia Group

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Bahia Group
Stratigraphic range: Valanginian-Hauterivian
TypeGroup
Sub-unitsMarfim Formation
Lithology
PrimaryConglomerate
Location
Coordinates [ ⚑ ] : 12°54′S 38°30′W / 12.9°S 38.5°W / -12.9; -38.5
Paleocoordinates [ ⚑ ] 12°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 is located in Brazil
Bahia Group
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.

Ornithischians

Ornithischians of the Bahia Group
Genus Species Location Stratigraphic position Material Notes Images
Iguanodontia Indet. Indeterminate Bahia Valanginian to Hauterivian
Tietasaura T. derbyiana Bahia Valanginian to Hauterivian Left Femur A elasmarian ornithopod

Sauropods

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

Theropods

Theropods of the Bahia Group
Genus Species Location Stratigraphic position Material Notes Images
Carcharodontosauria Indet. Indeterminate Bahia Valanginian to Hauterivian Vertebrae A giant species, possible the largest Carcharodontosaurian know.
Spinosauridae Indet. Indeterminate Bahia Valanginian to Hauterivian
Tyrannosauroidea? Indet. Indeterminate Bahia Hauterivian to Barremian

Pterosaurs

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

Crocodylomorphs

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

Turtles

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

Fish

Fishes of the Bahia Group
Genus Species Location Stratigraphic position Material Notes Images
Acrodus A. nitidus Bahia Valanginian to Hauterivian A acrodontid hybodont
"Belonostomus" "B". carinatus Bahia Hauterivian to Barremian A aspidorhynchid fish
Calamopleurus C. mawsoni Bahia Hauterivian to Barremian A vidalamiine amiid
Ellimmichthys[5] E. longicostatum Bahia Berriasian to Valanginian A ellimmichthyiform fish
E. spinosus
Lepidotes L. spp. Bahia Valanginian to Barremian A lepidotid fish
Mawsonia M. gigas Bahia Valanginian to Barremian A mawsoniid coelacanth
Scrombroclupeoides S. scutata Bahia Hauterivian to Barremian A clupeomorph fish
Scutatuspinosus S. itapagipensis Bahia Hauterivian to Barremian A ellimmichthyiform fish

Molluscs

Bivalves

Bivalves of the Bahia Group
Genus Species Location Stratigraphic position Material Notes Images
Anhapoa[6] A. munizi Bahia Berriasian A iridinid bivalve
Duplexium[6] D. jatobensis Bahia Berriasian A iridinid bivalve

See also

  • List of dinosaur-bearing stratigraphic units

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" (in en). Zoological Journal of the Linnean Society. doi:10.1093/zoolinnean/zlz057. ISSN 0024-4082. 
  5. ↑ de Figueiredo, Francisco J.; Gallo, Valéria (2021-01-01). "Revision of †Ellimmichthys longicostatus (Clupeomorpha: †Ellimmichthyiformes) from the Lower Cretaceous of Brazil with comments on the taxonomy of related species". Journal of South American Earth Sciences 105. doi:10.1016/j.jsames.2020.103006. ISSN 0895-9811. Bibcode: 2021JSAES.10503006D. https://www.sciencedirect.com/science/article/pii/S0895981120305496. 
  6. ↑ 6.0 6.1 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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