Lecho Formation

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Lecho Formation
Stratigraphic range: Late Cretaceous
Type Geological formation
Underlies Yacoraite Formation
Region South America

The Lecho Formation is a geological formation in Argentina whose strata date back to the Late Cretaceous. Dinosaur remains are among the fossils that have been recovered from the formation.[1]

According to Frankfurt and Chiappe (1999), the Lecho Formation is located in northwestern Argentina and is composed of reddish sandstones. The Lecho is part of the Upper/Late Cretaceous Balbuena Subgroup (Salta Group), which is a near-border stratigraphic unit of the Andean sedimentary basin. The paleoenvironment was a fluvio-lacustrine coastal plain. Fossils from this formation include the titanosaur Saltasaurus along with a variety of avian and non-avian theropods.


Vertebrate paleofauna[edit]

Dinosaurs reported from the Lecho Formation
Genus Species Location Stratigraphic position Material Notes Images


E. bonapartei

Scapula, partial coracoid, humerus, partial radius, partial ulna[2]



E. leali[3]

"Postcranial elements."[4]



L. bretincola[3]

"Tarsometatarsus and tibiotarsus."[4]



M. minor

Partial humerus[2]


M. saltariensis


M. vincei


M. whetstonei

Partial humerus[2]


N. leali[3]

Isolated elements from the head and foot, as well as a verebral arch.[5] A putative oviraptorosaurian cervical vertebra [6] is likely to belong to this taxon.[7]

Noasaurid abelisaurs


S. loricatus[3]

"Partial skeletons of at least [six] individuals, including jaws and armor."[8]

Saltasaurid titanosaurs


S. australis[3]

"Tarsometatarsus and phalanges."[9]

Avisaurid enantiornithes


Y. brevipedalis[3]



See also[edit]


  1. ^ Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Cretaceous, South America)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 600-604. ISBN 0-520-24209-2.
  2. ^ a b c d e Walker and Dyke (2009). "Euenantiornithine birds from the Late Cretaceous of El Brete (Argentina)." Irish Journal of Earth Sciences, 27: 15-62.
  3. ^ a b c d e f g h i j k l "63.7 Provincia de Salta, Argentina; 3. Lower Kirtland Formation," in Weishampel, et al. (2004). Page 603.
  4. ^ a b "Table 11.1," in Weishampel, et al. (2004). Page 213.
  5. ^ "Table 3.1," in Weishampel, et al. (2004). Page 49.
  6. ^ Frankfurt, N.G., and L.M. Chiappe (1999). "A Possible Oviraptorosaur From The Late Cretaceous of Northwestern Argentina," Journal of Vertebrate Paleontology, 19(1): 101-105.
  7. ^ Agnolin, F.L., and Martinelli, A.G. (2007) "Did oviraptorosaurs (Dinosauria; Theropoda) inhabit Argentina?" Cretaceous Research, 28: 785-790.
  8. ^ "Table 13.1," in Weishampel, et al. (2004). Page 270.
  9. ^ a b "Table 11.1," in Weishampel, et al. (2004). Page 214.


  • Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp. ISBN 0-520-24209-2.