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Particle Size Sorting of Proglacial Eolian Materials¹

ABSTRACT

Bagnold proposed that there is a critical size separating particles moved by saltation from those carried in suspension. This theory was tested in proglacial deposits near the Wabash and White Rivers in Indiana. Here the westerly winds of glacial times piled the sand by saltation into a band of dunes and carried the silt in suspension and deposited it as loess east of the dunes. Soil C horizons were sampled in transects across the dune and loess belts of both areas and were analyzed for particle size using narrow size intervals. In both areas a zone between 40µ and 80µ diameter separates dune sand from loess. Between these limits the dune sands and loess are more than 94% exclusive of each other. Glacial till that is representative of the source of outwash, which, in turn, is the source of the eolian deposits, contains much 40 to 80µ material. This size fraction, however, is practically missing from both the dunes and the loess. Apparently this fraction was selectively removed by wind or by water and deposited elsewhere.

¹ Journal Paper no. 3977, Purdue Univ., Agr. Exp. Sta., Lafayette, Ind. Contribution from the Agronomy Dept.

² Associate Professor of Agronomy.

Received for publication June 4, 1970. Accepted for publication June 24, 1970.