The Tarija Concha Formation is a Tremadocian geologic formation of southern Bolivia. The shales and siltstones were deposited in a shallow marine environment.Tarija Concha and Tilcara at Fossilworks.org
Fossil content The formation has provided the following fossils: Bienvillia tetragonalis Leptoplastides granulosus Apatokephalus sp.
See also List of fossiliferous stratigraphic units in Bolivia
References
Further reading R. Suárez Soruco. 1976. El sistema ordovícico en Bolivia. Revista Tecnica YPF Bolivia 5(2):111-123