Abstract
Sand-sized grains comprising the planar cross-bedding found in a Late Wisconsinan outwash deposit near Caledon, Ontario, show an obliquely downslope preferred orientation. The average angle of obliquity measured from the downdip direction is about 35°. Such a grain fabric was probably produced by the resultant force of the gravity pull that orients the grains to the dip direction and the lateral traction current of the channel flow which tends to imbricate the grains to the upstream dip. This asymmetric mode of grain fabric was formed during deposition of a laterally accreted outwash bar. Detailed examination of grain fabric makes it possible to distinguish the planar cross-bedding of a micro-deltaic origin from that of other types of bar deposit built either partly or predominantly by lateral accretion.
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