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PORTAIL D'INFORMATION GÉOGRAPHIQUE

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  • Geochemical evidence for an eolian sand dam across the North and South Platte Rivers in Nebraska
  • Barrage ; Colorado ; Cours d'eau ; Dune ; Eolien ; Etats-Unis ; Fluviatile ; Great Plains ; Géochimie ; Nebraska ; Paléogéographie ; Quaternaire ; Sable
  • Aeolian features ; Colorado ; Dam ; Dune ; Fluvial processes ; Geochemistry ; Nebraska ; Palaeogeography ; Quaternary ; Sand ; Stream ; United States of America
  • Geochemical and geomorphic data from dune fields in southwestern Nebraska provide new evidence that the Nebraska Sand Hills once migrated across the North and South Platte rivers and dammed the largest tributary system to the Missouri River
  • . The Lincoln County and Imperial dune fields, which lie downwind of the South Platte River, have compositions intermediate between the Nebraska Sand Hills and northeastern Colorado dunes. The most likely explanation for the intermediate composition
  • is that the Lincol County and Imperial dunes are derived in part from the Nebraska Sand Hills and in part from the South Platte River.
  • 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