Llallagua Formation

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.

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.