The Cercado Formation is a geologic group in Dominican Republic. The formation comprises siltstones, limestones, claystones, sandstones and conglomerates deposited in a shallow marine to reef environment. The Cercado Formation, unconformably overlying the Baitoa Formation, preserves bivalve, gastropod, decapod and coral fossils dating back to the Late Miocene to Early Pliocene period.Cercado Formation at Fossilworks.org
See also List of fossiliferous stratigraphic units in the Dominican Republic
References
Further reading A. F. Budd and K. G. Johnson. 1999. Origination preceding extinction during late Cenozoic turnover of Caribbean reefs. Paleobiology 25(2):188-200 M. J. Rathbun. 1920. Additions to West Indian Tertiary Decapod Crustaceans. Proceedings of the United States National Museum 58:381-384 J. B. Saunders, P. Jung, and B. Biju-Duval. 1986. Neogene Paleontology in the Northern Dominican Republic: 1. Field Surveys, Lithology, Environment, and Age. Bulletins of American Paleontology 89(323):1-79