Earth:Malhada Vermelha Formation

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Short description: Geological formation in northeastern Brazil
Malhada Vermelha Formation
Stratigraphic range: Valanginian-Hauterivian
~138–130 Ma
TypeGeological formation
Unit ofIguatu Group
UnderliesLima Campos Formation
OverliesQuixoá Formation
Thickness500–800 m (1,600–2,600 ft)
Lithology
PrimarySandstone
OtherSiltstone
Location
Coordinates [ ⚑ ] : 6°18′S 39°06′W / 6.3°S 39.1°W / -6.3; -39.1
Paleocoordinates [ ⚑ ] 4°30′S 6°12′W / 4.5°S 6.2°W / -4.5; -6.2
RegionCeará
Country Brazil
ExtentLima Campos & Malhada Vermelha Basins
Malhada Vermelha Formation is located in Brazil
Malhada Vermelha Formation
Malhada Vermelha Formation (Brazil)

The Malhada Vermelha Formation is an Early Cretaceous (Valanginian to Hauterivian) geologic formation in Ceará, northeastern Brazil . The formation preserves reptile, fish and ichnofossils.

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]

See also

References

  1. 1.0 1.1 Malhada Vermelha Formation at Fossilworks.org
  2. Paula Moreira, 2018, p.106
  3. 3.0 3.1 3.2 Pinheiro et al., 2013
  4. Paula Moreira, 2018, p.107
  5. Leonardi, 1989

Bibliography