Earth:La Quinta Formation
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Short description: Geologic formation in South America
| La Quinta Formation Stratigraphic range: Hettangian—Aalenian 201.46–174.8 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 |
| Paleocoordinates | [ ⚑ ] 0°06′N 42°42′W / 0.1°N 42.7°W |
| Region | Cesar-Ranchería & Maracaibo Basins Serranía del Perijá & Cordillera de Mérida |
| Country |  Colombia Venezuela |
| Type section | |
| Named for | La Quinta quarry |
.jpg)  La Quinta Formation (Venezuela) | |
The La Quinta Formation is a Jurassic geologic formation which crops out in the Cordillera de Mérida and Serranía del Perijá of western Venezuela and northeastern 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] Tachiraptor, and Perijasaurus[3] are among the fossils that have been recovered from the formation.[4]
U–Pb zircon analysis demonstrates that the formation dates to 200.91+0.55 Ma at its base[2] and a maximum age of 174.8 Ma.[3]
Paleofauna
| Genus | Species | location | Material | Notes | Images |
|---|---|---|---|---|---|
| Laquintasaura[2] | L. venezuelae |
Venezuela |
Partial skeleton | First dinosaur identified from Venezuela | |
|
P. lapaz |
Cesar Department, Colombia |
Partial dorsal vertebra | Previously known as the "Cesar sauropod", and was the first dinosaur discovered in Colombia | ||
| T. admirabilis | Venezuela | A tibia and ischium |
Regional correlations
See also
- List of dinosaur-bearing rock formations
- List of stratigraphic units with few dinosaur genera
Notes
References
- ↑ Barret et al., 2008, p.164
- ↑ 2.0 2.1 2.2 Barret et al., 2014
- ↑ 3.0 3.1 "A sauropod from the Lower Jurassic La Quinta Formation (Dept. Cesar, Colombia) and the initial diversification of eusauropods at low latitudes". Journal of Vertebrate Paleontology 42: e2077112. 2022. doi:10.1080/02724634.2021.2077112. https://figshare.com/articles/dataset/A_sauropod_from_the_Lower_Jurassic_La_Quinta_formation_Dept_Cesar_Colombia_and_the_initial_diversification_of_eusauropods_at_low_latitudes/20464696.
- ↑ Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607
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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