Earth:Jagua Formation

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Short description: Geologic formation in Cuba
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
Coordinates [ ⚑ ] : 22°42′N 83°36′W / 22.7°N 83.6°W / 22.7; -83.6
RegionPinar del Río Province
Country Cuba
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

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 [4]
Cryptoclidus C. vignalensis Laguna de Piedra Jagua Vieja Mb. A sauropterygian [5]
Gallardosaurus G. iturraldei Sierra de Caiguanabo
~8 km (5.0 mi) east of Viñales
Jagua Vieja Mb. A pliosaurid [6]
Nesodactylus N. hesperius Hoyo del Palmar
10 km (6.2 mi) northeast of Viñales
Jagua Vieja Mb. A rhamphorhynchid pterosaur [4]
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 [5]
Vinialesaurus V. caroli Viñales A cryptoclidid plesiosaur [7]
Geosaurus Puerta de Ancón
Sierra de Guasasa
Jagua Vieja Mb. A Metriorhynchid [8]
Ophthalmosauridae Ophthalmosauridae indet. [9]
Somphospondyli Somphospondyli indet. Material consists of a first or second metacarpal, now lost.[10]

Other fossils

  • Favreina
  • Globochaete
  • Gryphaea mexicana - Pan de Azúcar Mb.[11]
  • Lepidotes gloriae[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. 4.0 4.1 Gasparini et al., 2004
  5. 5.0 5.1 Laguna de Piedra at Fossilworks.org
  6. Gasparini, 2009
  7. Gasparini et al., 2002
  8. Gasparini & Iturralde Vinent, 2001, p.538
  9. Gasparini & Iturralde Vinent, 2001, p.542
  10. Apesteguía, S.; Ceballos Izquierdo, Y.; Iturralde-VINENT, M. (2019-09-02). "New taxonomic assignment for a dinosaur sauropod bone from Cuba" (in en). Historical Biology 33 (5): 737–742. doi:10.1080/08912963.2019.1661406. ISSN 0891-2963. 
  11. Sierra Ancón at Fossilworks.org
  12. Hoyo de San Antonio at Fossilworks.org
  13. Hoyo de la Sierra at Fossilworks.org
  14. 14.0 14.1 14.2 14.3 Mogote La Mina at Fossilworks.org
  15. Jagua Vieja at Fossilworks.org
  16. Viñales at Fossilworks.org

Bibliography

Further reading