Jagua Formation
Introduction The '''Jagua Formation''' is a Late Jurassic (middle to late Oxfordian) geologic formation in the Sierra de los Órganos and Sierra del Rosario mountain ranges in Pinar del Río Province, western Cuba. Plesiosaur, pliosaur, pterosaur, metriorhynchid, turtle and dinosaur remains are among the fossils that have been recovered from its strata.
Description The formation comprises marine shales and limestones. The  thick Jagua Vieja Member consists of black shales and horizontally laminated marly micritic to biomicritic limestones. The latter contains calcareous concretions which the fossils are found in. The formation overlies the San Cayetano Formation and is overlain by the Guasasa Formation. The bedding direction is steeply dipping towards the northwest.
Fossil content === Vertebrate paleofauna ==='''Paleofauna of the Jagua Formation''' Genus  Species  Location  Stratigraphic position  Description  Notes  Image ''Cacibupteryx''  ''C. caribensis''  Mogote Jagua Vieja  Jagua Vieja Mb. A rhamphorhynchid pterosaur     ''Cryptoclidus''  ''C. vignalensis''  Laguna de Piedra  Jagua Vieja Mb. A sauropterygian     ''Gallardosaurus''  ''G. iturraldei''  Sierra de Caiguanabo~ east of Viñales  Jagua Vieja Mb. A pliosaurid    ''Nesodactylus''  ''N. hesperius''  Hoyo del Palmar northeast of Viñales  Jagua Vieja Mb. A rhamphorhynchid pterosaur    ''Notoemys'' ''N. oxfordensis''  Valle de Viñales   A platychelyid  pan-pleurodiran turtle, originally described under the separate genus of ''Caribemys''  ''Sphaerodontes''  ''S. caroli''  Laguna de Piedra  Jagua Vieja Mb. An ichthyosaur or a fish     ''Vinialesaurus''  ''V. caroli''  Viñales   A cryptoclidid plesiosaur     ''Geosaurus''    Puerta de AncónSierra de Guasasa  Jagua Vieja Mb. A Metriorhynchid    Ophthalmosauridae  Ophthalmosauridae indet. Somphospondyli  Somphospondyli indet. Material consists of a first or second metacarpal, now lost. === Other fossils ===*''Favreina''*''Globochaete''* ''Gryphaea mexicana'' - Pan de Azúcar Mb. * ''Lepidotes gloriae''* ''Liostrea mairei''* ''L. sandalina'' - Zacarías Mb. * ''Nanogyra (Nanogyra) nana'' - Zacarías Mb. * ''Ostrea broughtoni'' - Zacarías Mb. * ''Plicatula cf. weymouthiana'' - Zacarías Mb. * ''Voltzia palmeri''* ''Perisphinctes sp.''
See also * Plesiosaur stratigraphic distribution* List of pterosaur-bearing stratigraphic units
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