Llallagua Formation

Llallagua Formation
Stratigraphic range: Rhuddanian-Homerian ~443–428  Ma PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Underlies	Kirusillas Formation
Lithology
Primary	Sandstone
Other	Shale
Location
Coordinates	17°48′S64°48′W / 17.8°S 64.8°W / -17.8; -64.8
Approximate paleocoordinates	46°30′S127°54′W / 46.5°S 127.9°W / -46.5; -127.9
Region	Potosí Department
Country	Bolivia
Extent	Cordillera Oriental
Type section
Named for	Llallagua
Llallagua Formation (Bolivia)

The Llallagua Formation is a Rhuddanian to Homerian geologic formation of western Bolivia. The formation comprises siliciclastic sediments. The fossil fauna suggests a warm water, nearshore current was active allowing northern hemisphere benthos to exist in the formation. ^[1]

Fossil content

The formation has provided the following fossils:

• Atrypa reticularis
• Leptaena rhomboidalis
• Orthostrophia cf. dartae
• Chonetes sp.
• Dalejina sp.
• Dalmanites sp.
• Orthostrophella sp.
• Plectodonta sp.
• Protochonetes sp.
• Syntrophia sp.

See also

• List of fossiliferous stratigraphic units in Bolivia
  • Lipeón Formation

References

1. Llallagua Formation at Fossilworks.org

Further reading

• G. Laubacher, A. J. Boucot, and J. Gray. 1982. Additions to Silurian stratigraphy, lithofacies, biogeography and paleontology of Bolivia and southern Peru. Journal of Paleontology 56(5):1138-1170