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La Quinta Formation

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Coordinates: 8°09′N 72°01′W / 8.15°N 72.02°W / 8.15; -72.02
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This article is about the formation in Colombia and Venezuela. For the amber-bearing Mexican formation, see La Quinta Formation, Mexico.
La Quinta Formation
Stratigraphic range: Hettangian
201.46–200.36 Ma
↓
The La Quinta Formation near its type section in Táchira, Venezuela
TypeGeological formation
UnderliesRío Negro Formation
OverliesMucuchachi Formation
Thicknessup to 11,000 ft (3,400 m)
Lithology
PrimarySandstone
OtherTuff, conglomerate
Location
Coordinates8°09′N 72°01′W / 8.15°N 72.02°W / 8.15; -72.02
Approximate paleocoordinates0°06′N 42°42′W / 0.1°N 42.7°W / 0.1; -42.7
RegionCesar-Ranchería Basin, Maracaibo Basin
Serranía del Perijá, Cordillera de Mérida
Country Colombia
 Venezuela
Type section
Named forLa 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

  • Template:Cite LSA
  • 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

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