Middle- and late-Holocene dune reactivation in the Nebraska Sand Hills, USA

arena changement climatique clima climat climate climatic change datation au radiocarbone drought dunas dune dune soils dunes elemento primario del suelo eua nebraska palaeosols paleosoles pedogenese radiocarbon dating sable sand sediment sedimento soil formation soil genesis soil parent materials sol de dune suelo de dunas usa wind erosion