Los Rastros Formation

Los Rastros Formation
Stratigraphic range: Ladinian-Carnian
Type Geological formation
Unit of Agua de la Peña Group
Overlies Chañares Formation
Lithology
Primary Claystone, sandstone
Other Mudstone
Location
Coordinates 29°06′S 69°06′W / 29.1°S 69.1°W / -29.1; -69.1Coordinates: 29°06′S 69°06′W / 29.1°S 69.1°W / -29.1; -69.1
Approximate paleocoordinates 45°48′S 34°54′W / 45.8°S 34.9°W / -45.8; -34.9
Region La Rioja & San Juan Provinces
Country  Argentina
Extent Ischigualasto-Villa Unión Basin

The Los Rastros Formation is a Ladinian to Carnian geologic formation in Argentina. Fossil theropod tracks as well as many insects have been reported from the formation.[1]

Description

The formation overlies the Ischicuca Formation and is overlain by the Ischigualasto Formation. The formation belongs to the Agua de la Peña Group of the Ischigualasto-Villa Unión Basin, where it is exposed in the Ischigualasto Provincial Park, a World Heritage site in Argentina.[2] The formation of claystones, mudstones and sandstones was deposited in a deltaic to lacustrine environment.[3]

Fossil content

The following fossils among others have been recovered from the formation:[3]

  • Babuskaya elaterata
  • Rigalites ischigualastensis
  • Saaloscytina carmonae
  • Miomina riojana
  • Condorblatta lutzae
  • Lariojablatta chanarensis
  • Argentinosyne bonapartei
  • Argentinocupes pulcher
  • Ischichucasyne cladocosta

See also

References

  1. ↑ Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.
  2. ↑ Kent et al, 2014, p.7959
  3. 1 2 Los Chañares at Fossilworks.org

Bibliography

  • Kent, Dennis V.; Paula Santi Malnis; Carina E. Colombi; Oscar A. Alcober, and 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 111. 7958–7963. Accessed 2018-09-08.
  • Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp.  ISBN 0-520-24209-2.

Further reading

  • R. G. Martins-Neto, A. Mancuso, and O. F. Gallego. 2005. The Triassic Insect Fauna from Argentina. Blattoptera from the Los Rastros Formation (Bermejo Basin), La Rioja Province. Ameghiniana 42(4):1-21
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