Cancañiri Formation

Cancañiri Formation
Stratigraphic range: Katian-Hirnantian
~460–439 Ma

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Cancañiri Formation; Stratigraphic range: Katian-Hirnantian; ~460–439 Ma PreꞒ Ꞓ O S D C P T J K Pg N
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	17.7°S 66.3°W
Approximate paleocoordinates	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]