San Lorenzo Formation, Bolivia

For other uses, see San Lorenzo Formation.

San Lorenzo Formation
Stratigraphic range: Dapingian ~
Type	Geological formation
Lithology
Primary	Shale, sandstone
Other	Quartzite
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
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

File:Scotese 470 ma.png

Early Ordovician (470 Ma)

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

• List of fossiliferous stratigraphic units in Bolivia

Further reading

• R. Suárez Soruco. 1976. El sistema ordovícico en Bolivia. Revista Tecnica YPF Bolivia 5(2):111-123