La Quinta Formation

La Quinta Formation
Stratigraphic range: Hettangian
201.46–200.36 Ma
↓
The La Quinta Formation near its type section in Táchira, Venezuela
Type Geological formation
Underlies Río Negro Formation
Overlies Mucuchachi Formation
Thickness up to 11,000 ft (3,400 m)
Lithology
Primary Sandstone
Other Tuff, conglomerate
Location
Coordinates 8°09′N 72°01′W / 8.15°N 72.02°W / 8.15; -72.02Coordinates: 8°09′N 72°01′W / 8.15°N 72.02°W / 8.15; -72.02
Approximate paleocoordinates 0°06′N 42°42′W / 0.1°N 42.7°W / 0.1; -42.7
Region Cesar-Ranchería Basin, Maracaibo Basin
Serranía del Perijá, Cordillera de Mérida
Country  Colombia
 Venezuela
Type section
Named for La Quinta quarry

The La Quinta Formation is a Mesozoic geologic formation which crops out in the Cordillera de Mérida and Serranía del Perijá, Venezuela and Colombia. The formation is also present in the subsurface of the Cesar-Ranchería and Maracaibo Basins. At its type locality near La Grita, Táchira, it consists of a basal dacitic tuff followed by interlayered sandstones, tuffs, siltstones and rare limestones.[1] Dinosaur remains including Laquintasaura,[2] and Tachiraptor, are among the fossils that have been recovered from the formation.[3]

Fossil associations suggested that the La Quinta Formation was of Early to Middle Jurassic age,[4] while a more recent estimate based on U–Pb zircon analysis demonstrates that the bonebed has a maximum depositional age of 200.91+0.55 Ma.[5]

See also

References

  1. ↑ Barret et al., 2008, p.164
  2. ↑ Barret et al., 2014
  3. ↑ Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607
  4. ↑ Barret et al., 2008, p.175
  5. ↑ La Quinta quarry at Fossilworks.org

Bibliography

  • Barrett, Paul M.; Richard J. Butler; Roland Mundil; Torsten M. Scheyer; Randall B. Irmis, and Marcelo R. Sánchez-Villagra. 2014. A palaeoequatorial ornithischian and new constraints on early dinosaur diversification. Proceedings of the Royal Society B 281. 1–7. Accessed 2018-08-18.
  • Barrett, P. M., R. J. Butler, S. C. Moore-Fay, F. E. Novas, J. M. Moody, J. M. Clark, and M. R. Sänchez-Villagra. ‘Dinosaur Remains from the La Quinta Formation (Lower or Middle Jurassic) of the Venezuelan Andes’. Paläontologische Zeitschrift 82, no. 2 (2008): 163–177.
  • Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp.  ISBN 0-520-24209-2.

Maps

  • Colmenares, Fabio; Milena Mesa; Jairo Roncancio; Edgar Arciniegas; Pablo Pedraza; Agustín Cardona; César Silva; Jhoamna Romero, and Sonia Alvarado and Oscar Romero, Felipe Vargas, Carlos Santamaría. 2007. Plancha 14 - Albania - 1:100,000, 1. INGEOMINAS. Accessed 2017-06-06.
  • Colmenares, Fabio; Milena Mesa; Jairo Roncancio; Edgar Arciniegas; Pablo Pedraza; Agustín Cardona; César Silva; Jhoamna Romero, and Sonia Alvarado and Oscar Romero, Felipe Vargas, Carlos Santamaría. 2007. Plancha 21 - Fonseca - 1:100,000, 1. INGEOMINAS. Accessed 2017-06-06.
  • Colmenares, Fabio; Milena Mesa; Jairo Roncancio; Edgar Arciniegas; Pablo Pedraza; Agustín Cardona; César Silva; Jhoamna Romero, and Sonia Alvarado and Oscar Romero, Felipe Vargas, Carlos Santamaría. 2007. Plancha 34 - Agustín Codazzi - 1:100,000, 1. INGEOMINAS. Accessed 2017-06-06.
  • González, Javier; Jairo Clavijo; Marina Hernández, and Carlos García. 2002. Plancha 40 - Bosconia - 1:100,000, 1. INGEOMINAS. Accessed 2017-06-06.
  • Hernández, Marina; Jairo Clavijo, and Javier González. 2001. Plancha 47 - Chiriguaná - 1:100,000, 1. INGEOMINAS. Accessed 2017-06-06.
  • Hernández, Marina, and Jairo Clavijo. 2008. Plancha 48 - La Jagua de Ibirico - 1:100,000, 1. INGEOMINAS. Accessed 2017-06-06.
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