Rio Bonito Formation

Rio Bonito Formation
Stratigraphic range: Sakmarian-Artinskian
TypeGeological formation
Unit ofGuata Group, Paraná Basin
UnderliesIrati Formation (Paraná Basin)
Palermo Formation (Pelotas Basin)
OverliesItararé Group (Paraná Basin)
Pelotas Batholith & Dom Feliciano Belt (Pelotas Basin)
Lithology
PrimarySandstone
Location
Coordinates25°18′S 50°30′W / 25.3°S 50.5°W / -25.3; -50.5
Approximate paleocoordinates45°42′S 29°24′W / 45.7°S 29.4°W / -45.7; -29.4
RegionSão Paulo, Paraná, Santa Catarina, Rio Grande do Sul and Uruguay
Country Brazil
 Uruguay
Rio Bonito Formation is located in Brazil
Rio Bonito Formation
Rio Bonito Formation (Brazil)

The Rio Bonito Formation is a geological formation of the Paraná and Pelotas Basins of Permian age. It is represented by a succession of cyclic sedimentary packages of sandstones, siltstones and shales which bear extensive deposits of coal that has been extracted since the 19th century.[1] The Rio Bonito Formation was deposited in a coastal environment, formed by rivers, deltas, bays and estuaries with tidal plains, barrier islands and shallow marine platform, at a time when the Paraná Basin was a large gulf of the ancient supercontinent Gondwana. This gulf was open to the southwest, to the old ocean Panthalassa. The Rio Bonito Formation outcrops occur mainly in the eastern border of the Paraná Basin, in a narrow band in the states of São Paulo, Paraná, Santa Catarina, Rio Grande do Sul and Uruguay.[2] The Rio Bonito Formation belongs to the second-order stratigraphic supersequence called Gondwana I.[3]

Glossopteris flora

The Glossopteris flora is characteristic of fossil sequences of the Gondwana supercontinent; it developed and became the dominant flora of the southern Permian to early Triassic, and became extinct at the end of that period. This flora is not only the main fossil content of the Rio Bonito Formation coals, the coal extracted as in Australia and South Africa's first work to record the occurrence of horizons megaflora associated with coal seams within a paleogeographic approach and palaeoclimatic in the Paraná Basin, was the study by White in 1908. This allowed a large correlation between Gondwana coal deposits in southern Brazil and those registered in South Africa, Australia, India and Antarctica, including showing that the latter has been in latitude near the south pole less than today, allowing the occurrence of an extensive flora.

Fossil content

Among others, the following fossil flora have been recovered from the formation:[4]

References

  1. ^ White, I.C. (1908) Comissão de Estudos das Minas de Carvão de Pedra do Brazil – Relatório final. (relatório bilíngüe, português e inglês); 617 p. + ilustr.; Imprensa Nacional, Rio de Janeiro, Brasil. IN: CPRM (2008). 30 cm. Edição comemorativa: 100 anos do Relatório White. Edição facsimilar. CDD 553.209816.
  2. ^ Milani, E. J.; Melo, J. H. G., Souza, P. A.; Fernandes, L. A. E França, A. B. – Bacia do Paraná. In: Cartas Estratigráficas - Boletim De Geociências da Petrobras, Rio de Janeiro, v. 15, n. 2, p. 265-287, May/November 2007.
  3. ^ Milani, E. J. – Evolução tectono-estratigráfica da Bacia do Paraná e seu relacionamento com a geodinâmica fanerozóica do Gondwana sul-ocidental. 1997. 2vol. Il. Tese (Doutorado) – Universidade Federal do Rio Grande do Sul, Curso de Pós-Graduação em Geociências, Porto Alegre, 1997.
  4. ^ Criciuma area at Fossilworks.org

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