Coordinates: 22°42′N 83°36′W / 22.7°N 83.6°W / 22.7; -83.6

Jagua Formation

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Jagua Formation
Stratigraphic range: Mid-Late Oxfordian
~158–156 Ma
↓
TypeGeological formation
Sub-unitsPan de Azúcar, Zacarías, Pimienta & Jagua Vieja Members
UnderliesGuasasa Formation
OverliesSan Cayetano Formation
Thickness160 m (520 ft)
Lithology
PrimaryShale, limestone
Location
CoordinatesLua error in Module:Coordinates at line 489: attempt to index field 'wikibase' (a nil value).
RegionPinar del Río Province
CountryCuba
ExtentSierra de los Órganos, Sierra del Rosario
Type section
Named forJagua

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

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The formation comprises marine shales and limestones. The 60 metres (200 ft) 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

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Vertebrate paleofauna

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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

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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

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Dinosaurs
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Genus Species Location Stratigraphic position Description Notes Image
Somphospondyli indet. Jagua Vieja Jagua Vieja Mb. A somphospondylan sauropod, the only dinosaur known from the formation. Previously identified as a camarasaurid. If it is a somphospondylan, it is the only record of this group from the early Late Jurassic of the Americas. Material consists of a first or second metacarpal, now lost.[5] [4][5]
Pterosaurs
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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
10 km (6.2 mi) northeast of Viñales 		Jagua Vieja Mb. A rhamphorhynchid pterosaur [6]
Crocodylomorphs
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Genus Species Location Stratigraphic position Description Notes Image
Cricosaurus C. suevicus 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
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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
~8 km (5.0 mi) 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
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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
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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

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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 Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  5. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  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

Bibliography

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  • Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Archived 2011-07-16 at the Wayback Machine
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Further reading

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