Spatial and temporal patterns of late quaternary eolian deposition, Eastern Colorado, U.S.A.

Chronology and geochemistry of late Holocene eolian deposits in the Brandon Sand Hills, Manitoba, Canada

“…Dunes in many parts of this region were long perceived to be relict landforms of full-glacial time (Wright, 1970;Sarnthein, 1978;Kutzbach and Wright, 1985), but it is now known that most dune "elds were last active in the Holocene. Stratigraphic studies combined with radiocarbon and luminescence dating methods demonstrate that eolian sands over a wide range of mid-continental North America have been active in the past 3000 years (David, 1971a, b;Ahlbrandt et al, 1983;Swinehart and Di!endal, 1990;Madole, 1994Madole, , 1995Holliday, 1995aHolliday, , b, 1997Forman et al, 1995;Loope et al, 1995;Arbogast, 1996;Muhs et al, 1996Muhs et al, , 1997aWolfe et al, 1995;Stokes and Swinehart, 1997). Furthermore, most of these studies have stratigraphic data indicating multiple periods of eolian activity in the late Holocene.…”

Geochemical and mineralogical evidence from eolian sediments for northwesterly mid-Holocene paleowinds, central Kansas, USA

“…Wind parameters calculated by the authors from data provided by the National Climatic Data Center. Paleowinds in eastern Colorado from Madole (1995), for the Great Bend Sand Prairie from Arbogast and Johnson (1998), and for western Kansas from the present study.…”

“…Recent studies in the Nebraska Sand Hills suggest that dunes were active there during the mid-Holocene, as well as before and after this period (Loope et al, 1995;Stokes and Swinehart, 1997). In Colorado, there are few eolian sands dated directly to the mid-Holocene, but these localities combined with soil-geomorphic relations indicate the possibility of mid-Holocene dune activity (Madole, 1995;Forman et al, 1995;Muhs et al, 1996). On the Southern High Plains of Texas, Holliday (1995b) reports that eolian sand deposition into draws was at a maximum during the early to mid-Holocene, widespread by &7500 yr BP, but most important from 6500 to 4500 yr BP.…”

“…Furthermore, dunes in the Great Bend Sand Prairie with relatively well developed A/Bt/C soil pro"les (the Pratt series, a Psammentic Haplustalf) are not likely to be of late Holocene age, because such pro"les probably take several thousands of years to develop, based on data from Colorado (Madole, 1995;Forman et al, 1995;Muhs et al, 1996). Therefore, we hypothesize that eolian sand movement out of the Arkansas River was at a maximum during the mid-Holocene, under drier conditions and northwesterly winds, due to a greater residence time of dry, Paci"c-derived air over the region.…”

“…1), with large dune "elds and sand sheets present in Nebraska (Ahlbrandt et al, 1983;Swinehart, 1990;Loope et al, 1995), northeastern Colorado (Madole, 1995;Muhs et al, 1996), Texas (Holliday, 1995a), and Kansas (Arbogast, 1996a, b). One of the largest dune "elds (&4500 km) of the Great Plains is the Great Bend Sand Prairie in Kansas, located within the`great benda of the Arkansas River in the south-central part of the state (Fig.…”