Late Holocene eolian activity in the mineralogically mature Nebraska Sand Hills

Auteur(s) et Affiliation(s)

MUHS, D.R.

U.S. Geological Survey, Federal Center, Denver, Etats-Unis

Description :
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 Hills must have had a long history, probably extending over more than one glacial-interglacial cycle, and the potential for reactivation is high.

Type de document :
Article de périodique

Source :
Quaternary research, issn : 0033-5894, 1997, vol. 48, n°. 2, p. 162-176, Collation : Illustration, Références bibliographiques : 61 ref.

Date :
1997

Editeur :
Pays édition : Etats-Unis, San Diego, CA, Elsevier

Langue :
Anglais