The Mari Mari Group is an Eifelian to Frasnian geologic group of the Amazon Basin in the state of Amazonas of northwestern Brazil. The group comprises shales and sandstones.[1]

Mari Mari Group
Stratigraphic range: Eifelian
~392–384 Ma
Late Devonian paleogeography (380 Ma)
TypeGeological group
Lithology
PrimaryShale
OtherSandstone
Location
Coordinates6°00′S 70°00′W / 6.0°S 70.0°W / -6.0; -70.0
Approximate paleocoordinates59°54′S 61°30′W / 59.9°S 61.5°W / -59.9; -61.5
RegionAmazonas
Country Brazil
ExtentAmazon Basin
Type section
Named forMarimari River
Mari Mari Group is located in Brazil
Mari Mari Group
Mari Mari Group (Brazil)

Fossil content

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The formation has provided fossils of Tentaculites sp., foraminifera and ostracods.[1][2]

References

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  1. ^ a b Mari Mari Group at Fossilworks.org
  2. ^ Melo, 1988

Bibliography

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  • Melo, J. H. G (1988), The Malvinokaffric realm in the Devonian of Brazil. N. J. McMillan, A. F. Embry, and D. J. Glass, eds. Devonian of the World, Volume I, Canadian Society of Petroleum Geologists. Calgary, Alberta, Canada, pp. 669–703