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Los Colorados Formation

Coordinates: 29°48′S 67°54′W / 29.8°S 67.9°W / -29.8; -67.9
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Not to be confused with Colorado Formation or Río Colorado Formation.
Los Colorados Formation
Stratigraphic range: Mid-Late Triassic
~227–213 Ma
TypeGeological formation
Location
Coordinates29°48′S 67°54′W / 29.8°S 67.9°W / -29.8; -67.9
RegionLa Rioja Province
Country Argentina

The Los Colorados Formation is a sedimentary rock formation found in La Rioja, Argentina. It has a Norian age (Late Triassic), and is notable for its fossils of early dinosaurs, including the coelophysoid Zupaysaurus and the "prosauropods" Coloradisaurus, Lessemsaurus, and Riojasaurus.[1] Magnetostratigraphic analysis suggests that the Los Colorados Formation was deposited between 227 and 213 million years ago.[2]

Fauna

Dinosaurs

Indeterminate theropod remains present in the Provincia de la Rioja.[1]

Dinosaurs of the Los Colorados Formation
Taxa Presence Notes Images

Genus:

  1. C. brevis
  1. Geographically present in the Provincia de la Rioja.[1]

"Skull, adult."[3]

Riojasaurus
Zupaysaurus

Genus:

  1. L. sauropoides
  1. Geographically present in the Provincia de la Rioja.[1]

"Partial cervical, dorsal, and sacral vertebrae, adult."[3]

Infraorder:

  1. Indeterminate remains.[1]
  2. Indeterminate remains.[1]
  1. Geographically present in the Provincia de la Rioja.[1]
  2. Geographically present in the Provincia de San Juan.[1]
  1. Includes Strenusaurus procerus.[1] "Dorsals, caudals, partial fore- and hindlimb."[4]

Genus:

  1. P. podocitus
  1. Geographically present in the Ischigualasto-Villa Unión Basin[5]
 Known from previously undescribed partial hindlimbs.[6]

Genus:

  1. R. incertus
  1. 1. Geographically present in the Provincia de la Rioja.[1]

Genus:

  1. Z. rougieri
  1. Geographically present in the Provincia de la Rioja.[1]

See also

References

  1. ^ a b c d e f g h i j k l Weishampel, David B; et al., 2004. "Dinosaur distribution (Late Triassic, South America)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 527–528. ISBN 0-520-24209-2.
  2. ^ Dennis V. Kent; Paula Santi Malnis; Carina E. Colombi; Oscar A. Alcober; Ricardo N. Martínez (2014). "Age constraints on the dispersal of dinosaurs in the Late Triassic from magnetochronology of the Los Colorados Formation (Argentina)". Proceedings of the National Academy of Sciences. advance online publication. doi:10.1073/pnas.1402369111.
  3. ^ a b "Table 12.1," in Weishampel, et al., 2004. Page 234.
  4. ^ "Table 12.1," in Weishampel, et al., 2004. Page 237.
  5. ^ Martín D. Ezcurra (2017). "A new early coelophysoid neotheropod from the Late Triassic of northwestern Argentina". Ameghiniana. in press. doi:10.5710/AMGH.04.08.2017.3100
  6. ^ Cite error: The named reference Martín D. Ezcurra (2017) was invoked but never defined (see the help page).
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