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PORTAIL D'INFORMATION GÉOGRAPHIQUE

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  • Late Holocene eolian activity in the mineralogically mature Nebraska Sand Hills
  • Cycle climatique ; Datation C 14 ; Eolien ; Etats-Unis ; Géochimie ; Holocène ; Minéralogie ; Nebraska ; Paléogéographie ; Quaternaire ; Stratigraphie ; Sécheresse
  • Aeolian features ; C 14 dating ; Climatic cycle ; Drought ; Geochemistry ; Holocene ; Mineralogy ; Nebraska ; Palaeogeography ; Quaternary ; Stratigraphy ; United States of America
  • The age of sand dunes in the Nebraska Sand Hills has been controversial, with some investigators suggesting a full-glacial age and others suggesting that they were last active in the late Holocene. New radiocarbon ages of unaltered bison bones
  • and organic-rich sediments suggest that eolian sand deposition occurred at least twice in the past 3000 C 14 yr B.P. in 3 widely separated localities and as many as 3 times in the past 800 C 14 yr at 3 other localities. Therefore, dunes of the Nebraska Sand
  • Stabilized eolian deposits, mostly parabolic dunes and sand sheets, cover much of the landscape of northeastern Colorado and adjacent parts of southwestern Nebraska in four geographically distinct dune fields. Stratigraphic and soil geomorphic