The Tonosí Formation is a geologic formation in Panama. It preserves fossils dating back to the Paleogene period (Priabonian).Tonosí Formation at Fossilworks.org
Fossil content Among others, the formation has provided fossils of: Harrisianella sp.Woodring, 1973, p.472
See also List of fossiliferous stratigraphic units in Panama
References
Bibliography
Further reading A. K. Miller and W. M. Furnish. 1939. Aturias from the Eocene of Panama. Journal of Paleontology 13(1):77-79