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 | |
|---|---|
| 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 |  |
  Pircancha Formation (Bolivia) | |
Fossil content
Early Ordovician (470 Ma)
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.
gollark: Aren't Pis quite bad for idle power use?
gollark: It doesn't have a battery, screen, WAN modem, or anything like that.
gollark: It... isn't a phone?
gollark: Those exist?
gollark: I mean, I regularly drop my phone and it's not *too* cracked or scratched.
References
- "Rincon", "Escuela Seccional de Puesto Grande" at Fossilworks.org
- Pircancha Fm., Tarija and Chilcayo at Fossilworks.org
- Aubrechtová, 2015
Bibliography
- Aubrechtová, Martina. 2015. A revision of the Ordovician cephalopod Bactrites sandbergeri Barrande: systematic position and palaeobiogeography of Bactroceras. Geobios 48. 193–211. Accessed 2019-03-03.
Further reading
- B.-D. Erdtmann, B. Weber, H.-P. Schultze and S. Egenhoff. 2000. A possible agnathan plate from the lower Arenig (Lower Ordovician) of South Bolivia. Journal of Vertebrate Paleontology 20(2):394-399
- M. Toro and S. Fernandez. 1979. Los fósiles de la formación Pircancha aflorante en Chilcayo, Provincia Méndez - Depto. Tarija. Revista de la Academia Nacional de Ciencas de Bolivia 163-169
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