The Iquiri Formation is an Eifelian to Frasnian geologic formation of central Bolivia. The formation comprises black shales and sandstones.Lajas locality, south of Rio Piray at Fossilworks.org
Fossil content The formation has provided fossils of Proteolobus walli.
See also List of fossiliferous stratigraphic units in Bolivia
References
Further reading G. D. Wood. 1997. The acritarch Proteolobus walli gen et sp. nov. from the Devonian Iquiri Formation of Bolivia: a possible coenobial alga. Micropaleontology 43(3):325-331