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The Los Ranchos Formation is a Lower Cretaceous volcanic pile that forms the base of the Greater Antilles in central Hispaniola. It has been divided into basal units consisting largely of (locally pillowed) spilite flows (Cotui Member) and keratophyre and quartz keratophyre flows, minor tuffs, and intrusions (Quita Sueno Member), which are overlain by debris flows and other fragmental rocks, finer grained, water-laid sediment (Meladito Member), and unpillowed spilite flows (Platanal and Naviza Members). The Meladito and Platanal Members are cut by the Zambrana Fragmental Member, of uncertain origin, and the Pueblo Viejo Maar-Diatreme Members, which formed during a phreatomagmatic...

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