Categories
  • Burdigalian
  • Neogene Chile
  • Paleogene Chile
  • Sandstone formations
  • Shale formations
  • Geology of Los Lagos Region
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    Vargas Formation

    From Wikipedia - Reading time: 6 min
    Vargas Formation
    Stratigraphic range: Late Oligocene–Early Miocene
    TypeGeological formation
    Lithology
    PrimaryBlack shale, sandstone
    Location
    RegionLos Lagos Region
    CountryChile
    Type section
    Named byUrbina
    Year defined2001

    The Vargas Formation is a sedimentary formation on the left bank of Palena River in the western Patagonian Andes of southern Chile. The formation is made of black shale and sandstone that deposited in the Late Oligocene or Early Miocene epoch some 26 million years ago. The formation has contact across a fault plane with granitoids of Cretaceous age of the North Patagonian Batholith.[1]

    The exposures of Vargas Formation are small and its fossils poorly preserved. Gastropods, bivalves, echinoderms, and planktic foraminifer fossils have been found in the formation.[1]

    Hans Steffen was the first to investigate Vargas Formation with his research being published in 1944.[1]

    See also

    [edit]
    • Geology of Chile
    • Chaicayán Group
    • Ayacara Formation
    • La Cascada Formation
    • Puduhuapi Formation

    References

    [edit]
    1. ^ a b c Encinas, Alfonso; Folguera, Andrés; Bechis, Florencia; Finger, Kenneth L.; Zambrano, Patricio; Pérez, Felipe; Benarbé, Pablo; Tapia, Francisca; Riffo, Ricardo; Buatois, Luis; Orts, Darío; Nielsen, Sven N.; Valencia, Victor V.; Cituño, José; Oliveros, Verónica; De Girolamo Del Mauro, Lizet; Ramos, Víctor A. (2018). "The Late Oligocene–Early Miocene Marine Transgression of Patagonia". In Folguera, A.; Contreras Reyes, E.; Heredia, N.; et al. (eds.). The Evolution of the Chilean-Argentinean Andes. Springer. pp. 443–474. ISBN 978-3-319-67774-3.
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