Jagua Formation

Jagua Formation
Stratigraphic range: Mid-Late Oxfordian
~
TypeGeological formation
Sub-unitsPan de Azúcar, Zacarías, Pimienta & Jagua Vieja Members
UnderliesGuasasa Formation
OverliesSan Cayetano Formation
Thickness160 m (520 ft)
Lithology
PrimaryShale, limestone
Location
Coordinates22°42′N 83°36′W / 22.7°N 83.6°W / 22.7; -83.6
RegionPinar del Río Province
CountryCuba
ExtentSierra de los Órganos, Sierra del Rosario
Type section
Named forJagua
Jagua Formation is located in Cuba
Jagua Formation
Jagua Formation (Cuba)

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 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

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
GenusSpeciesLocationStratigraphic positionDescriptionNotesImage
Aspidorhynchus A. arawaki Jagua Vieja Mb. A aspidorhynchid fish [4]
Caturus C. deani Valle los Jazmines, Jagua Vieja Jagua Vieja Mb. A caturid halecomorph. In need of taxonomic revision. [4]
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]
Hypsocormus H. leedsi Laguna de Piedra Jagua Vieja Mb. A pachycormiform fish. In need of taxonomic revision. [4]
Lepidotes L. gloriae Jagua Vieja Jagua Vieja Mb. A lepidotid lepisosteiform. [4]
?Leptolepis L. euspondylus Mogote La Mina Jagua Vieja Mb. A leptolepid fish. In need of taxonomic revision. [4]
Luisichthys L. vinalesensis Jagua Vieja Jagua Vieja Mb. A varasichthyid fish [4]
Pholidophorus P. sp. A pholidophorid fish [4]
Sauropsis S. woodwardi Viñales A pachycormiform fish. In need of taxonomic revision. [4]

Reptiles

Dinosaurs
GenusSpeciesLocationStratigraphic positionDescriptionNotesImage
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
GenusSpeciesLocationStratigraphic positionDescriptionNotesImage
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
GenusSpeciesLocationStratigraphic positionDescriptionNotesImage
Cricosaurus C. suevicus Puerta de Ancón
Sierra de Guasasa		 Jagua Vieja Mb. A metriorhynchid thalattosuchian [4][7]
Geosaurus G. sp. A geosaurine metriorhynchid
Thalattosuchia indet. Hoyo de la Sierra A thalattosuchian of uncertain affinities.
Plesiosaurs
GenusSpeciesLocationStratigraphic positionDescriptionNotesImage
?"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]
Vinialesaurus V. caroli Viñales A cryptoclidid plesiosaur [10]
Ichthyosaurs
GenusSpeciesLocationStratigraphic positionDescriptionNotesImage
Ichthyosauria indet. Laguna de Piedra Jagua Vieja Mb. An indeterminate ichthyosaur, initially described as "Ichthyosaurus torrey" [4]
Ophthalmosauridae Indet. Indeterminate Viñales [11]
Turtles
GenusSpeciesLocationStratigraphic positionDescriptionNotesImage
Notoemys N. oxfordensis Valle de Viñales A platychelyid pan-pleurodiran turtle, originally described under the separate genus of Caribemys

Other fossils

  • Favreina
  • Globochaete
  • Gryphaea mexicana - Pan de Azúcar Mb.[12]
  • Liostrea mairei[13]
  • L. sandalina - Zacarías Mb.[14]
  • Nanogyra (Nanogyra) nana - Zacarías Mb.[14]
  • Ostrea broughtoni - Zacarías Mb.[14]
  • Plicatula cf. weymouthiana - Zacarías Mb.[14]
  • Voltzia palmeri[15]
  • Perisphinctes sp.[16]

See also

References

  1. ↑ Jagua Formation at Fossilworks.org
  2. ↑ Barrett et al., 2008
  3. ↑ Iturralde Vinent & Norell, 1996
  4. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Iturralde-Vinent, Manuel; Izquierdo, Yasmani Ceballos (2015-02-23). "Catálogo de Especímenes de Vertebrados del Jurásico Tardío (pieces, reptiles) de Cuba Occidental". Revista Paleontología Mexicana. 4 (1): 25–40. doi:10.22201/igl.05437652e.2015.4.1.288. ISSN 2007-5189.
  5. 1 2 Apesteguía, S.; Ceballos Izquierdo, Y.; Iturralde-VINENT, M. (2019-09-02). "New taxonomic assignment for a dinosaur sauropod bone from Cuba". Historical Biology. 33 (5): 737–742. doi:10.1080/08912963.2019.1661406. hdl:11336/171484. ISSN 0891-2963. S2CID 202854022.
  6. 1 2 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. 1 2 3 4 Mogote La Mina at Fossilworks.org
  15. ↑ Jagua Vieja at Fossilworks.org
  16. ↑ Viñales at Fossilworks.org

Bibliography

Further reading

This page is issued from Wikipedia. The text is available under Creative Commons Attribution-Share Alike 4.0 unless otherwise noted. Additional terms may apply for the media files.