The Llallagua Formation is a Rhuddanian to Homerian geologic formation of western Bolivia. The formation comprises siliciclastic sedimentary rocks. The fossil fauna suggests a warm water, nearshore current was active allowing northern hemisphere benthos to exist in the formation.Llallagua Formation at Fossilworks.org
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
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