The Missão Velha Formation is a late Jurassic 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: Late Jurassic ~ | |
| Type | Geological formation |
| Unit of | Vale do Carirí Group |
| Underlies | Abaiara Formation |
| Overlies | Breto Santo Formation |
| Thickness | 100–200 m (330–660 ft) |
| Lithology | |
| Primary | Sandstone |
| Location | |
| Coordinates | 7°18′S 39°06′W / 7.3°S 39.1°W |
| Approximate paleocoordinates | 7°06′S 6°30′W / 7.1°S 6.5°W |
| Region | Pernambuco, Piauí & Ceará |
| Country |  Brazil |
| Extent | Araripe 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, as well as a tooth from an abelisaurid theropod.
Geology
editFossil content
editThe following fossils were reported from the formation:[1]
See also
editReferences
edit- ^ Missão Velha Formation at Fossilworks.org
- ^ a b c d e f g h i j k l m n o p Brito et al., 1994
- ^ Felipe L. Pinheiro; Ana Emilia Q. de Figueiredo; Paula C. Dentzien-Dias; Daniel C. Fortier; Cesar L. Schultz; Maria Somália S. Viana (2013). "Planohybodus marki sp. nov., a new fresh-water hybodontid shark from the Early Cretaceous of northeastern Brazil". Cretaceous Research. 41: 210–216. doi:10.1016/j.cretres.2012.12.005.
- ^ Ribeiro, Theo Baptista; Cupello, Camila; de Mayrink, Diogo; da Costa Pereira, Paulo Victor Luiz Gomes; Brito, Paulo Machado (15 April 2024). "A theropod tooth from the Missão Velha Formation (Late Jurassic-Early Cretaceous) of the Araripe Basin: oldest Brazilian Abelisaurid record". Historical Biology: 1–11. doi:10.1080/08912963.2024.2336982. ISSN 0891-2963.
- ^ a b c Carvalho et al., 1995
Bibliography
edit- Geology
- Assine, Mario L (1992), "Análise estratigráfica da Bacia do Araripe, Nordeste do Brasil" (PDF), Revista Brasileira de Geociências, 22 (3): 289–300, doi:10.25249/0375-7536.1992289300, retrieved 21 August 2018
- Bétard, François; Peulvast, Jean-Pierre; de Oliveira Magalhães, Alexsandra; Carvalho Neta, Maria de Lourdes; de Freitas, Francisco Idalecio (2017), "Araripe Basin: A Major Geodiversity Hotspot in Brazil" (PDF), Geoheritage: 1–18, retrieved 21 August 2018 Archived 21 August 2018 at the Wayback Machine
- Scherer, C.M.d.S.; Jardim de Sá, E.F.; Córdoba, V.C.; Sousa, D.d.C.; Aquino, M.M.; Cardoso, F.M.C. (2013), "Tectono-Stratigraphic evolution of the upper Jurassic-Neocomian rift succession, Araripe Basin, Northeast Brazil" (PDF), Journal of South American Geosciences: 1–43, retrieved 21 August 2018
- Paleontology
- Carvalho, I. d. S.; Viana, M. S. S.; Filho, M. F. L. (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.; Bertini, R.J.; Martill, D.M.; Salles, L.O. (1994), Vertebrate fauna from the Missão Velha Formation (Lower Cretaceous, N.E. Brazil), Boletim do 3° sobre o Cretáceo do Brasil, Campus de Rio Claro/SP, UNESP, pp. 139–140