The Barreirinha Formation is a late Frasnian geologic formation of the Amazon Basin in the state of Amazonas of northern Brazil. The group comprises deep marine black shales and sandstones.Barreirinha Formation at Fossilworks.org
Fossil content The formation has provided conodont fossils of:Cardoso, 2015
Mehlina gradata Ozarkodina aff. sannemanni Cryptotaxis sp. Polygnathus sp. ?Prioniodina sp.
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