Earth:Cancañiri Formation
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| Cancañiri Formation Stratigraphic range: Katian-Hirnantian ~460–439 Ma | |
|---|---|
| Type | Geological formation |
| Underlies | Uncía Formation |
| Overlies | Amutara & San Benito Formations |
| Thickness | Up to 1,500 m (4,900 ft) |
| Lithology | |
| Primary | Sandstone, shale |
| Other | Siltstone |
| Location | |
| Coordinates | [ ⚑ ] : 17°42′S 66°18′W / 17.7°S 66.3°W |
| Paleocoordinates | [ ⚑ ] 44°12′S 127°24′W / 44.2°S 127.4°W |
| Region | Cochabamba & Potosí Departments |
| Country |  Bolivia |
| Extent | Cordillera Oriental |
| Type section | |
| Named for | Cancañiri |
  Cancañiri Formation (Bolivia) | |
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]
Fossil content
The formation has provided the following fossils:
- Destombesium pacochicoensis
- Dinorthis flabellulum
- Drabovinella curiosa
- Tunariorthis cardocanalis
- Oanduporella sp.
- Rostricellula sp.
See also
References
- ↑ Díaz Martínez, 2005, p.237
- ↑ Díaz Martínez, 1997, p.55
- ↑ Along "Coboce" Road near Irpa Irpa Railway Station at Fossilworks.org
- ↑ Changolla, railway on the Cochabamba - Oruro Railway at Fossilworks.org
- ↑ Paco Chico, ~40 km west of Potosí at Fossilworks.org
- ↑ La Llorona de Cancañiri
- ↑ Díaz Martínez, 1997, p.56
Bibliography
- 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). Geogaceta 38. 235–238. Accessed 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. Geogaceta 22. 55–57. Accessed 2019-03-03.
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
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