The Arimao Formation is a geologic formation in Cuba. It preserves mainly ammonite and rudist fossils dating back to the Santonian period.Arimao Formation at Fossilworks.org
See also List of fossiliferous stratigraphic units in Cuba
References
Further reading
R. Rojas, M. Iturralde-Vinent, and P. W. Skelton. 1995. Stratigraphy, composition and age of Cuban rudist-bearing deposits. Revista Mexicana de Ciencias Geológicas 12(2):272-291