Missão Velha Formation
Missão Velha Formation Stratigraphic range: Early Aptian ~120–118 Ma | |
---|---|
Type | Geological formation |
Unit of | |
Underlies | |
Overlies | |
Thickness | 2–10 m (6.6–32.8 ft) |
Lithology | |
Primary | Sandstone |
Location | |
Coordinates | 7°18′S 39°06′W / 7.3°S 39.1°WCoordinates: 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 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 , overlying the and overlain by the .
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[]
Fossil content[]
The following fossils were reported from the formation:[1]
- Fish
- Reptiles
- Amphibians
- Ichnofossils
See also[]
References[]
Bibliography[]
- Geology
- Análise estratigráfica da Bacia do Araripe, Nordeste do Brasil. Revista Brasileira de Geociências 22. 289–300. Accessed 2018-08-21. . 1992.
- Araripe Basin: A Major Geodiversity Hotspot in Brazil. Geoheritage _. 1–18. Accessed 2018-08-21. ; ; ; , and . 2017.
- Tectono-Stratigraphic evolution of the upper Jurassic-Neocomian rift succession, Araripe Basin, Northeast Brazil. _. 1–43. Accessed 2018-08-21. ; ; ; ; , and . 2013.
- Paleontology
- Anais da Academia Brasileira de Ciências 67. 433-442. ; , and . 1995. Os icnofósseis de dinossauros da Bacia do Araripe (Crétaceo Inferior, Ceará-Brasil) - Dinosaur ichnofossils from the Araripe Basin (Lower Cretaceous, Ceará, Brazil).
- ; ; , and . 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.
Categories:
- Geologic formations of Brazil
- Lower Cretaceous Series of South America
- Cretaceous Brazil
- Aptian Stage
- Sandstone formations
- Alluvial deposits
- Ichnofossiliferous formations
- Paleontology in Brazil
- Environment of Ceará
- Environment of Pernambuco
- Environment of Piauí
- Landforms of Ceará
- Landforms of Pernambuco
- Landforms of Piauí
- Northeast Region, Brazil