Jagua Formation
The Jagua Formation is a Late Jurassic geologic formation in western Cuba, dating to the middle to late Oxfordian (about 158–156 million years ago). It is found in the Sierra de los Órganos and Sierra del Rosario in Pinar del Río Province.
It is mainly marine shale and limestone. The formation has several sub-units: Pan de Azúcar, Zacarías, Pimienta, and Jagua Vieja. The Jagua Vieja Member is about 60 meters thick and consists of black shales and laminated limestones with calcareous concretions that host fossils.
The Jagua Formation lies above the San Cayetano Formation and below the Guasasa Formation. The beds dip steeply toward the northwest. The total thickness is around 160 meters (about 520 feet).
Fossils found include plesiosaurs, pliosaurs, pterosaurs, metriorhynchids, turtles, and dinosaurs.
The formation is named after Jagua, with the type section in the Jagua area.
This page was last edited on 3 February 2026, at 13:32 (CET).