Llallagua Formation Explained

Llallagua Formation
Type:	Geological formation
Period:	Homerian
Age:	Rhuddanian-Homerian ~
Prilithology:	Sandstone
Otherlithology:	Shale
Namedfor:	Llallagua
Region:	Potosí Department
Coordinates:	-17.8°N -64.8°W
Paleocoordinates:	-46.5°N -127.9°W
Underlies:	Kirusillas Formation
Extent:	Cordillera Oriental

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

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

Notes and References

1. https://paleobiodb.org/classic/displayCollResults?collection_no=25084 Llallagua Formation