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| Barreirinha Formation | |
|---|---|
| Stratigraphic range: late Frasnian ~380–376 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓ | |
 Late Devonian paleogeography (380 Ma) | |
| Type | Geological formation |
| Lithology | |
| Primary | Black shale |
| Other | Sandstone, pyrite |
| Location | |
| Coordinates | 4°06′S 58°00′W / 4.1°S 58.0°W / -4.1; -58.0 |
| Approximate paleocoordinates | 64°18′S 36°24′W / 64.3°S 36.4°W / -64.3; -36.4 |
| Region | Amazonas |
| Country |  Brazil |
| Extent | Amazon Basin |
| Type section | |
| Named for | Barreirinha |
  Barreirinha Formation (Brazil) | |
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.
Fossil content
The formation has provided conodont fossils of:
References
- ^ Barreirinha Formation at Fossilworks.org
- Cardoso, 2015
Bibliography
- Cardoso, C. N.; Sanz López, J.; Blanco Ferrera, S.; Lemos, V. B.; Scomazzon, A. K. (2015), "Frasnian conodonts at high palaeolatitude (Amazonas Basin, north Brazil)", Palaeogeography, Palaeoclimatology, Palaeoecology, 418: 57–64, Bibcode:2015PPP...418...57C, doi:10.1016/j.palaeo.2014.11.007