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.
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. (en)
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. (en)