Sepetiba Formation

Sepetiba Formation
Stratigraphic range: Pleistocene-Holocene
~2.6–0 Ma
↓
Type Geological formation
Unit of Itamambuca Group
Overlies Iguape Fm., Marambaia Fm.
Thickness up to 570 m (1,870 ft)
Lithology
Primary Coquina
Location
Coordinates 26°6′S 43°43′W / 26.100°S 43.717°W / -26.100; -43.717Coordinates: 26°6′S 43°43′W / 26.100°S 43.717°W / -26.100; -43.717
Region Santos Basin, South Atlantic
Country  Brazil
Type section
Named for Sepetiba

Location of the Santos Basin
Close-up of a coquina; carbonitic sandstones composed of broken shells

The Sepetiba Formation (Portuguese: Formacão Sepetiba) is a geological formation of the Santos Basin offshore of the Brazilian states of Rio de Janeiro, São Paulo, Paraná and Santa Catarina. The predominantly coquina formation dates to the Pleistocene period to recent and has a variable but maximum thickness of 570 metres (1,870 ft). The formation is the uppermost unit of the Santos Basin.

Etymology

The formation is named after Sepetiba, a neighbourhood of Rio de Janeiro.

Description

The Sepetiba Formation is the uppermost formation of the Santos Basin stratigraphy. It has a variable thickness, with a maximum of 570 metres (1,870 ft),[1] due to the proximal erosion of the uppermost part. The formation consists of whitish grey fine to coarse grained carbonitic sands. They are feldspar-rich, glauconitic coquinas consisting of bivalve fragments and foraminifera. The depositional environment is thought to be coastal.[2]

See also

References

  1. ↑ Kiang Chang et al., 2008, p.32
  2. ↑ Clemente, 2013, p.24

Bibliography

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