Barreirinha Formation

Not to be confused with Barreirinhas Formation.

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
Stratigraphic range: late Frasnian ~
Late Devonian paleogeography (380 Ma)
Type	Geological formation
Lithology
Primary	Black shale
Other	Sandstone, pyrite
Location
Coordinates	4.1°S 58.0°W / -4.1; -58.0
Approximate paleocoordinates	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)

Fossil content

The formation has provided conodont fossils of:

• Mehlina gradata
• Ozarkodina aff. sannemanni
• Cryptotaxis sp.
• Polygnathus sp.
• ?Prioniodina sp.

References

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