Jump to content

Los Rastros Formation

Coordinates: 29°06′S 69°06′W / 29.1°S 69.1°W / -29.1; -69.1
From Wikipedia, the free encyclopedia

This is an old revision of this page, as edited by Tisquesusa (talk | contribs) at 14:29, 6 August 2020 (Description). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

Los Rastros Formation
Stratigraphic range: Carnian
234.91–234.03 Ma
TypeGeological formation
Unit ofAgua de la Peña Group
UnderliesIschigualasto Formation
OverliesIschichuca Formation
ThicknessUp to 1,000 m (3,300 ft)
Lithology
PrimaryClaystone, sandstone
OtherMudstone
Location
Coordinates29°06′S 69°06′W / 29.1°S 69.1°W / -29.1; -69.1
Approximate paleocoordinates45°48′S 34°54′W / 45.8°S 34.9°W / -45.8; -34.9
RegionLa Rioja & San Juan Provinces
Country Argentina
ExtentIschigualasto-Villa Unión Basin
Los Rastros Formation is located in Argentina
Los Rastros Formation
Los Rastros Formation (Argentina)

The Los Rastros Formation is a Ladinian to Carnian fossiliferous formation of the Agua de la Peña Group in the Ischigualasto-Villa Unión Basin in northwestern Argentina. Fossil theropod tracks,[1] as well as many insects, fossil fish of Myriolepis,[2] bivalves and crustaceans and flora have been reported from the formation.

Description

File:Scotese 220 ma.png
Late Triassic (220 Ma)

The formation overlies the Ischicuca Formation and is overlain by the Ischigualasto Formation.[3] 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.[4] The up to 1,000 metres (3,300 ft) thick formation of claystones, mudstones and sandstones was deposited in a deltaic to lacustrine environment during the first post-rift sequence in the basin.[3][5]

A CA-TIMS U-Pb zircon age of 234.47 ± 0.44 Ma from the lower Los Rastros Formation was published in 2020. The acquired age demonstrates that most of the overlying lacustrine strata within the basin were deposited during or after the Carnian Pluvial Event (CPE) that lasted from 237 to 227 Ma approximately.[6]

Fossil content

The following fossils among others have been recovered from the formation:[5]

See also

References

  1. ^ Weishampel et al., 2004, pp. 517-607
  2. ^ a b c d e f g h i j k Leonardi, 1994, p.20
  3. ^ a b Aceituno Cieri, 2015, p.60
  4. ^ Kent et al, 2014, p.7959
  5. ^ a b Los Chañares at Fossilworks.org
  6. ^ Mancuso et al., 2020
  7. ^ a b Martins Neto et al., 2005, p.5
  8. ^ Martins Neto et al., 2005, p.16
  9. ^ Martins Neto et al., 2005, p.10
  10. ^ a b Martins Neto et al., 2005, p.12
  11. ^ Martins Neto et al., 2005, p.8
  12. ^ a b Martins Neto et al., 2005, p.14
  13. ^ Martins Neto et al., 2005, p.13
  14. ^ Leonardi, 1994, p.21

Bibliography

  • Template:Cite LSA
  • Template:Cite LSA
  • Template:Cite LSA
  • Template:Cite LSA doi:10.1016/j.gr.2020.05.009
  • Template:Cite LSA
  • Template:Cite LSAISBN 0-520-24209-2