Pircancha Formation
Geologic formation in Bolivia
From Wikipedia, the free encyclopedia
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 ~ | |
| 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 |
| Approximate paleocoordinates | 45.3°S 129.1°W |
| 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.