| San Lorenzo Formation | |
|---|---|
| Stratigraphic range: Dapingian ~478–466 Ma PreꞒ Ꞓ O S D C P T J K Pg N | |
| Type | Geological formation |
| Lithology | |
| Primary | Shale, sandstone |
| Other | Quartzite |
| Location | |
| Coordinates | 21°00′S 65°00′W / 21.0°S 65.0°W / -21.0; -65.0 |
| Approximate paleocoordinates | 45°18′S 129°06′W / 45.3°S 129.1°W / -45.3; -129.1 |
| Region | Tarija Department |
| Country |  Bolivia |
| Type section | |
| Named for | San Lorenzo |
  San Lorenzo Formation, Bolivia (Bolivia) | |
The San Lorenzo Formation is a Dapingian geologic formation of southern Bolivia. The dark gray, greenish, and black shale with thin intercalations of white-yellow quartzites were deposited in an open marine submarine fan environment.
Fossil content
The formation has provided the following fossils:
- Didymograptus nitidus
- Dinorthis obispoensis
- Orthambonites calligramma
- Peelerophon oehlerti
- Tetragraptus quadribrachiatus
- Thysanopyge argentina
- Yutagraptus vdeflexus
- Phyllograptus cf. typus
- Dictyonema sp.
- Endoceras sp.
- Lecanospira sp.
- Megalaspidella sp.
- Pachendoceras sp.
See also
References
- Camargo Syncline at Fossilworks.org
- Camargo Syncline 2 at Fossilworks.org
Further reading
- R. Suárez Soruco. 1976. El sistema ordovícico en Bolivia. Revista Tecnica YPF Bolivia 5(2):111-123