Corda Formation
Corda Formation Stratigraphic range: Late Aptian-Early Albian ~ | |
---|---|
Type | Geological formation |
Underlies | |
Overlies | Itapecuru Formation |
Lithology | |
Primary | Red sandstone |
Location | |
Coordinates | 5°42′S 47°30′W / 5.7°S 47.5°WCoordinates: 5°42′S 47°30′W / 5.7°S 47.5°W |
Approximate paleocoordinates | 5°06′S 14°48′W / 5.1°S 14.8°W |
Region | Tocantins |
Country | Brazil |
Extent | Parnaíba Basin |
Type section | |
Named for | Corda River |
Corda Formation (Brazil) |
The Corda Formation is a red sandstone geologic formation in the Parnaíba Basin in Tocantins, Brazil. It was formed during the Neoaptian to Eoalbian series of the Early Cretaceous.
Large-scale fossil sauropod tracks have been reported from the formation.[1][2][3][4]
Origin[]
The Corda Formation is characterized by reddish sandstones, that were probably deposited in windy deserts and fast flowing freshwater streams. Therefore, fossils are very rare.[1]
Occurrence[]
This formation outcrops in the central part of the Parnaíba Basin, between the mouth of the Araguaia River in the west the Parnaíba River in the east.[1]
Lithology[]
The Corda Formation consists largely of red sandstone, with very fine to medium grain size, rich in zeolites and iron oxide. Where whinstones[clarification needed] are overlaying fragments of this rock are also present. Typical structures of wind dunes (cross bedding, ripples, and grain flow) are common. This is consistent with deposition in a desert system.[1]
See also[]
- List of dinosaur-bearing rock formations
- Sauropod tracks
- Romualdo Formation, contemporaneous fossiliferous formation of the Araripe Basin
- Itapecuru Formation, contemporaneous fossiliferous formation of the and Parnaíba Basins
References[]
Bibliography[]
- Report on the Upper Permian and Lower Cretaceous fossiliferous localities vertebrates-bearing in the central north of Tocantins State, Brazil. Brazilian Geographical Journal: Geosciences and Humanities research medium, Uberlândia 1. 372–386. Accessed 2019-02-16. . 2010.
- Annotated Atlas of South America Tetrapod Footprints (Devonian to Holocene) with an appendix on Mexico and Central America, 1–248. Ministerio de Minas e Energia - Companhia de Pesquisa de Recursos Minerais, Geological Service of Brazil. Accessed 2019-03-25. . 1994.
- The Dinosauria, 2nd edition, 1–880. Berkeley: University of California Press. Accessed 2019-02-21. ISBN 0-520-24209-2 ; , and . 2004.
- Geologic formations of Brazil
- Lower Cretaceous Series of South America
- Cretaceous Brazil
- Albian Stage
- Aptian Stage
- Sandstone formations
- Fluvial deposits
- Ichnofossiliferous formations
- Fossiliferous stratigraphic units of South America
- Paleontology in Brazil
- Geography of Tocantins