San Lorenzo Formation, Bolivia Explained

San Lorenzo Formation
Type:	Geological formation
Period:	Dapingian
Age:	Dapingian ~
Prilithology:	Shale, sandstone
Otherlithology:	Quartzite
Namedfor:	San Lorenzo
Region:	Tarija Department
Coordinates:	-21°N -65°W
Paleocoordinates:	-45.3°N -129.1°W

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.^{[1] [2]}

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

• 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

Notes and References

1. http://www.fossilworks.org/cgi-bin/bridge.pl?a=collectionSearch&collection_no=8843 Camargo Syncline
2. http://www.fossilworks.org/cgi-bin/bridge.pl?a=collectionSearch&collection_no=197270 Camargo Syncline 2