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 1,500 metres (4,900 ft) thick formation,[1] were deposited in a glacial foreshore to deep water turbiditic environment.[2][3][4][5] The formation is named after Cancañiri, a mining town close to Llallagua, where a local legend of a possessed woman is believed.[6] 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.[7]

Cancañiri Formation
Stratigraphic range: Katian-Hirnantian
~460–439 Ma
TypeGeological formation
UnderliesUncía Formation
OverliesAmutara & San Benito Formations
ThicknessUp to 1,500 m (4,900 ft)
Lithology
PrimarySandstone, shale
OtherSiltstone
Location
Coordinates17°42′S 66°18′W / 17.7°S 66.3°W / -17.7; -66.3
Approximate paleocoordinates44°12′S 127°24′W / 44.2°S 127.4°W / -44.2; -127.4
RegionCochabamba & Potosí Departments
Country Bolivia
ExtentCordillera Oriental
Type section
Named forCancañiri
Cancañiri Formation is located in Bolivia
Cancañiri Formation
Cancañiri Formation
Cancañiri Formation
Cancañiri Formation (Bolivia)

Fossil content

edit

The formation has provided the following fossils:

See also

edit

References

edit

Bibliography

edit
  • Díaz Martínez, E (2005), "Procedencia y edad de las diamictitas del Paleozoico inferior de la cuenca de Perú-Bolivia (Gondwana occidental) - Provenance and age of diamictites in the lower Palaeozoic of the Peru-Bolivia basin (western Gondwana)" (PDF), Geogaceta, 38: 235–238, retrieved 2019-03-03
  • Díaz Martínez, E (1997), "Facies y ambientes sedimentarias de la Formación Cancañiri (Silúrico inferior) en La Cumbre de La Paz, norte de la Cordillera Oriental de Bolivia" (PDF), Geogaceta, 22: 55–57, retrieved 2019-03-03

Further reading

edit
  • 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