The Cancañiri Formation, also named as Cancañiri Tillite, is a Katian to Hirnantian geologic formation of central Bolivia. The pebbly, argillaceous sandstones, shales and siltstones of the up to thick formation,Díaz Martínez, 2005, p.237 were deposited in a glacial foreshore to deep water turbiditic environment.Díaz Martínez, 1997, p.55Along "Coboce" Road near Irpa Irpa Railway Station at Fossilworks.orgChangolla, railway on the Cochabamba - Oruro Railway at Fossilworks.orgPaco Chico, ~40 km west of Potosí at Fossilworks.org The formation is named after Cancañiri, a mining town close to Llallagua, where a local legend of a possessed woman is believed. The formation overlies the San Benito Formation in Cochabamba and the Amutara Formation in other parts. The Cancañiri Formation is overlain by the Uncía Formation.Díaz Martínez, 1997, p.56
Fossil content The formation has provided the following fossils:
Destombesium pacochicoensis Dinorthis flabellulum Drabovinella curiosa Tunariorthis cardocanalis Oanduporella sp. Rostricellula sp.
See also List of fossiliferous stratigraphic units in Bolivia
References
Bibliography
Further reading V. Havlicek and L. Branisa. 1980. Ordovician brachiopods of Bolivia: Succession of assemblages, climate control, affinity to Anglo-French and Bohemian provinces. Rozpravy Ceskoslovenske Akademie Ved. Rada Matematickych a Prirodnich Ved. Academia Praha, Prague, Czechoslovakia 90(1):1-54