The Pircancha Formation is a Floian to Dapingian geologic formation of southern Bolivia. The green mudstones, shales and sandstones were deposited in a shallow to open marine environment."Rincon", "Escuela Seccional de Puesto Grande" at Fossilworks.orgPircancha Fm., Tarija and Chilcayo at Fossilworks.org The fossil Pircanchaspis rinconensis is named after the formation.
Fossil content The formation has provided the following fossils:
Bactroceras boliviensisAubrechtová, 2015 Baltograptus deflexus, B. minutus Pircanchaspis rinconensis Pseudophyllograptus densus Tetragraptus cf. amii Didymograptus cf. suecicus Basilicus sp. Dinorthis sp. Famatinolithus sp. Geragnostus sp. Hoekaspis sp. Phyllograptus sp. Synhomalonotus sp.
See also List of fossiliferous stratigraphic units in Bolivia
References
Bibliography
Further reading B.-D. Erdtmann, B. Weber, H.-P. Schultze and S. Egenhoff. 2000. A possible agnathan plate from the lower Arenig (Lower Ordovician) of South Bolivia. Journal of Vertebrate Paleontology 20(2):394-399 M. Toro and S. Fernandez. 1979. Los fósiles de la formación Pircancha aflorante en Chilcayo, Provincia Méndez - Depto. Tarija. Revista de la Academia Nacional de Ciencas de Bolivia 163-169