The Ceru Mainsjie Formation is a geologic formation in Curaçao. It preserves fossils dating back to the Bartonian period.Ceru Mainsjie Formation at Fossilworks.org
See also List of fossiliferous stratigraphic units in Curaçao
References
Further reading P. Jung. 1974. Eocene Mollusks from Curaçao, West Indies. Verhandl. Naturf. Ges. Basel 84(1):483-500