Iscayachi Formation | |
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Stratigraphic range:
Tremadocian ~ | |
Type | Geological formation |
Thickness | 1,000 m (3,300 ft) |
Lithology | |
Primary | Shale, sandstone |
Location | |
Coordinates | 22°00′S 65°00′W / 22.0°S 65.0°W |
Approximate paleocoordinates | 46°18′S 128°18′W / 46.3°S 128.3°W |
Region | Potosí & Tarija Departments |
Country | ![]() |
Type section | |
Named for | Iscayachi |
The Iscayachi Formation, in older literature also referred to as Guanacuno Formation, is an extensive Tremadocian geologic formation of western and southern Bolivia. The shales and sandstones were deposited in a shallow marine to pro-delta environment. [1] [2] [3] [4] [5] The formation reaches a thickness of 1,000 metres (3,300 ft). [1]
The formation has provided the following fossils: