Jagua Formation

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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.[1] Plesiosaur, pliosaur, pterosaur,[2] 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 Script error: No such module "convert". 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.[3] 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

Based on Iturralde-Vinent & Izquierdo (2015):[4]

Color key
Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Bony fishes

Bony fish of the Jagua Formation
Genus Species Location Stratigraphic position Description Notes Image
Aspidorhynchus A. arawaki Jagua Vieja Mb. A aspidorhynchid fish [4] File:Aspidorhynchus 1904.png
Caturus C. deani Valle los Jazmines, Jagua Vieja Jagua Vieja Mb. A caturid halecomorph. In need of taxonomic revision. [4] File:Caturus NT.jpg
Eugnathides E. browni Mogote La Mina Jagua Vieja Mb. A pachycormiform fish. In need of taxonomic revision. [4]
Gyrodus G. macropthalmus cubensis Mogote La Mina Jagua Vieja Mb. A pycnodont. [4] File:Gyrodus hexagonus.png
Hypsocormus H. leedsi Laguna de Piedra Jagua Vieja Mb. A pachycormiform fish. In need of taxonomic revision. [4] File:Hypsocormus2.jpg
Lepidotes L. gloriae Jagua Vieja Jagua Vieja Mb. A lepidotid lepisosteiform. [4] File:Lepidotes elvensis.JPG
?Leptolepis L. euspondylus Mogote La Mina Jagua Vieja Mb. A leptolepid fish. In need of taxonomic revision. [4] File:Leptolepis NMNH.jpg
Luisichthys L. vinalesensis Jagua Vieja Jagua Vieja Mb. A varasichthyid fish [4] File:Luisichthys NT.jpg
Pholidophorus P. sp. A pholidophorid fish [4] File:Pholidophorus.jpg
Sauropsis S. woodwardi Viñales A pachycormiform fish. In need of taxonomic revision. [4] File:Sauropsis NT.jpg

Reptiles

Dinosaurs
Genus Species Location Stratigraphic position Description Notes Image
Camarasauridae indet. Jagua Vieja Jagua Vieja Mb. A camarasaurid sauropod, the only dinosaur known from the formation. Material consists of a first or second metacarpal, now lost.[5] [4][5]
Pterosaurs
Genus Species Location Stratigraphic position Description Notes Image
Cacibupteryx C. caribensis Mogote Jagua Vieja Jagua Vieja Mb. A rhamphorhynchid pterosaur [6]
Nesodactylus N. hesperius Hoyo del Palmar
Script error: No such module "convert". northeast of Viñales 		Jagua Vieja Mb. A rhamphorhynchid pterosaur [6]
Crocodylomorphs
Genus Species Location Stratigraphic position Description Notes Image
Cricosaurus C. sp. Puerta de Ancón
Sierra de Guasasa 		Jagua Vieja Mb. A metriorhynchid thalattosuchian [4][7] File:Cricosaurus albersdoeferi.png
Geosaurus G. sp. A geosaurine metriorhynchid
Thalattosuchia indet. Hoyo de la Sierra A thalattosuchian of uncertain affinities.
Plesiosaurs
Genus Species Location Stratigraphic position Description Notes Image
?"Cryptocleidus" "C." vignalensis Laguna de Piedra Jagua Vieja Mb. A sauropterygian, nomen dubium. [4][8]
Gallardosaurus G. iturraldei Sierra de Caiguanabo
~Script error: No such module "convert". east of Viñales 		Jagua Vieja Mb. A pliosaurid plesiosaur [9] File:Gallardosaurus NT.jpg
Vinialesaurus V. caroli Viñales A cryptoclidid plesiosaur [10] File:Vinialesaurus caroli.png
Ichthyosaurs
Genus Species Location Stratigraphic position Description Notes Image
Ichthyosauria indet. Laguna de Piedra Jagua Vieja Mb. An indeterminate ichthyosaur, initially described as "Ichthyosaurus torrey" [4]
Ophthalmosauridae Indet. Indeterminate Viñales [11]
Turtles
Genus Species Location Stratigraphic position Description Notes Image
Notoemys N. oxfordensis Valle de Viñales A platychelyid pan-pleurodiran turtle, originally described under the separate genus of Caribemys

Other fossils

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See also

References

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  1. ↑ Jagua Formation at Fossilworks.org
  2. ↑ Barrett et al., 2008
  3. ↑ Iturralde Vinent & Norell, 1996
  4. ↑ a b c d e f g h i j k l m n o Script error: No such module "Citation/CS1".
  5. ↑ a b Script error: No such module "Citation/CS1".
  6. ↑ a b Gasparini et al., 2004
  7. ↑ Gasparini & Iturralde Vinent, 2001, p.538
  8. ↑ Laguna de Piedra at Fossilworks.org
  9. ↑ Gasparini, 2009
  10. ↑ Gasparini et al., 2002
  11. ↑ Gasparini & Iturralde Vinent, 2001, p.542
  12. ↑ Sierra Ancón at Fossilworks.org
  13. ↑ Hoyo de la Sierra at Fossilworks.org
  14. ↑ a b c d Mogote La Mina at Fossilworks.org
  15. ↑ Jagua Vieja at Fossilworks.org
  16. ↑ Viñales at Fossilworks.org

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Bibliography

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Further reading

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