Pircancha Formation

The Pircancha Formation is a Floian to Dapingian geologic formation of southern Bolivia. The green mudstones, shales and sandstones were deposited in a shallow to open marine environment.^[1][2] The fossil Pircanchaspis rinconensis is named after the formation.

Pircancha Formation
Stratigraphic range: Floian-Dapingian ~478–466 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Thickness	1,800 m (5,900 ft)
Lithology
Primary	Mudstone
Other	Shale, sandstone, pyrite
Location
Coordinates	21.0°S 65.0°W / -21.0; -65.0
Approximate paleocoordinates	45.3°S 129.1°W / -45.3; -129.1
Region	Tarija Department
Country	Bolivia
Pircancha Formation (Bolivia)

Fossil content

The formation has provided the following fossils:

• Bactroceras boliviensis^[3]
• Baltograptus deflexus, B. minutus
• Pircanchaspis rinconensis
• Pseudophyllograptus densus
• Tetragraptus cf. amii
• Didymograptus cf. suecicus
• Basilicus sp.
• Dinorthis sp.
• Famatinolithus sp.
• Geragnostus sp.
• Hoekaspis sp.
• Phyllograptus sp.
• Synhomalonotus sp.

See also

• List of fossiliferous stratigraphic units in Bolivia