Missão Velha Formation

The Missão Velha Formation is an early Aptian geologic formation in northeastern Brazil's Araripe Basin where the states of Pernambuco, Piauí and Ceará come together. The formation is the middle stratigraphic unit of the Vale do Carirí Group, overlying the Brejo Santo Formation and overlain by the Abaiara Formation.

Missão Velha Formation
Stratigraphic range: Early Aptian
~120–118 Ma
TypeGeological formation
Unit ofVale do Carirí Group
UnderliesAbaiara Formation
OverliesBreto Santo Formation
Thickness2–10 m (6.6–32.8 ft)
Lithology
PrimarySandstone
Location
Coordinates7.3°S 39.1°W / -7.3; -39.1
Approximate paleocoordinates7.1°S 6.5°W / -7.1; -6.5
RegionPernambuco, Piauí & Ceará
Country Brazil
ExtentAraripe Basin

Map of the Araripe Basin with the Missão Velha Formation in green

The formation comprises whitish fine-to-medium quartzose arenites, with subrounded to rounded grains, deposited in an alluvial fan environment during the syn-rift phase of the Araripe Basin.

The Missão Velha Formation has provided macrofossils of various genera of fish and reptiles as snakes, crocodylomorphs and turtles. Ichnofossils of dinosaurs were also discovered in the formation.

Geology

late Early Cretaceous (105 Ma)

Fossil content

The following fossils were reported from the formation:[1]

gollark: How do we actually implement the random bit?
gollark: <@319753218592866315>
gollark: I'm very respectable opinionistically.
gollark: Plus, Host might consider you less cowardly.
gollark: Like you said, it would be more beeoeieieoeoeoeidal for you to win with all the points.

See also

References

  1. Missão Velha Formation at Fossilworks.org
  2. Brito et al., 1994
  3. Carvalho et al., 1995

Bibliography

Geology
Paleontology
  • Carvalho, I. d. S.; M. S. S. Viana, and M. F. L. Filho. 1995. Os icnofósseis de dinossauros da Bacia do Araripe (Crétaceo Inferior, Ceará-Brasil) - Dinosaur ichnofossils from the Araripe Basin (Lower Cretaceous, Ceará, Brazil). Anais da Academia Brasileira de Ciências 67. 433-442.
  • Brito, P.M.; R.J. Bertini; D.M. Martill, and L.O. Salles. 1994. Vertebrate fauna from the Missão Velha Formation (Lower Cretaceous, N.E. Brazil), 139-140. Boletim do 3° sobre o Cretáceo do Brasil, Campus de Rio Claro/SP, UNESP.
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