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Movement of Sorted Stripes, the Cinder Cone, Garibaldi Park, B. C., Canada
J. Ross Mackay and W. H. Mathews
Arctic and Alpine Research
Vol. 6, No. 4 (Autumn, 1974), pp. 347-359
Published by: INSTAAR, University of Colorado
Stable URL: http://www.jstor.org/stable/1550330
Page Count: 13
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Field studies have been carried out on the movement of sorted stripes at The Cinder Cone area, Garibaldi Park, B. C., since 1958. The investigations were designed to separate, insofar as possible, the processes which, it was thought, might be important in the downslope movement of the sorted stripes, viz.: frost heave, displacement by needle ice, surface wash, and drag from snowcreep. Deep frost heave was found not to occur, surface wash proved unimportant, and the drag from snowcreep caused minimal differential transfer of fines versus coarse material. The principal downslope movement appears to be caused by the growth and ablation of needle ice. The progressive downslope shift results more from toppling of the needle ice columns with sliding and rolling of the superincumbent pebbles, than from vertical gravity settling. For the period 1958 to 1968, the coarser material moved, on the average, about 15 cm yr-1 and the finer material about 35 cm yr-1. The mass transport amounted to a "layer" of loose material, about 0.5 cm thick, moving downslope at about 25 cm yr-1.