Orto Botanico Prof. Eugenio de Jesús Marcano

The El Mamey Formation is a geologic formation in the Dominican Republic. The formation consists of shales and sandstones interspersed with a conglomerate of well-rounded pebbles, deposited in a fluvio-deltaic environment. El Mamey Formation is one of the formations containing Dominican amber and preserves fossils dating back to the Burdigalian to Langhian period.

The Nivaje Shale is a geologic group in Dominican Republic. It preserves coral fossils dating back to the Miocene period.