Malhada Vermelha Formation
The Malhada Vermelha Formation is an Early Cretaceous (Valanginian to Hauterivian) geologic formation in Ceará, northeastern Brazil. The formation preserves reptile, fish and ichnofossils.
| Malhada Vermelha Formation Stratigraphic range: Valanginian-Hauterivian ~138–130 Ma | |
|---|---|
| Type | Geological formation |
| Unit of | Iguatu Group |
| Underlies | Lima Campos Formation |
| Overlies | Quixoá Formation |
| Thickness | 500–800 m (1,600–2,600 ft) |
| Lithology | |
| Primary | Sandstone |
| Other | Siltstone |
| Location | |
| Coordinates | 6.3°S 39.1°W |
| Approximate paleocoordinates | 4.5°S 6.2°W |
| Region | Ceará |
| Country |  |
| Extent | Lima Campos & Malhada Vermelha Basins |
  Malhada Vermelha Formation (Brazil) | |
Description
The formation is characterized by a cyclic sequence of siltstones that are intercalated with fine to medium sandstones with the presence of festoon cross-stratification and climbing ripples, deposited in an alluvial environment in a hot semiarid paleoclimate.[1]
The formation crops out in two minibasins, the Lima Campos and eponymous Malhada Vermelha Basins. The 500 to 800 metres (1,600 to 2,600 ft) thick formation overlies the Quixoá Formation and is overlain by the Lima Campos Formation.[2]
Fossil content
The following fossils were reported from the formation:[1]
- Fish
- cf. Lepitodes sp.[3]
- Hybodontidae indet.[3]
- Reptiles
- Ichnofossils
- Taenidium barretti[4]
- Carnosauria indet.[5]
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References
- Malhada Vermelha Formation at Fossilworks.org
- Paula Moreira, 2018, p.106
- Pinheiro et al., 2013
- Paula Moreira, 2018, p.107
- Leonardi, 1989
Bibliography
- Paula Moreira, João Victor; Francisco Danilo Sales Paula; Maria Somália Sales Viana; Arquimedes Pompeu de Paulo Chaves, and Ana Emilia Quezado de Figueiredo. 2018. Taenidium barretti Bradshaw, 1981 na Formação Malhada Vermelha (Cretáceo Inferior), Bacia de Malhada Vermelha, Ceará, Brasil - Taenidium barretti Bradshaw, 1981 in the Malhada Vermelha Formation (Lower Cretaceous), Malhada Vermelha Basin, Ceará, Brazil. Anuário do Instituto de Geociências - UFRJ 41. 104-112. Accessed 2020-06-18.
- Pinheiro, F.; A. E. Q. de Figueiredo; P. C. Dentzien-Dias; D. C. Fortier; C. I. Schultz, and M. S. 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.
- Leonardi, G. 1989. Inventory and statistics of the South American dinosaurian ichnofauna and its paleobiological interpretation, 165-178. D. D. Gillette & M. G. Lockley (ed.), Dinosaur Tracks and Traces.
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