Abstract

A study of the arrangement of component materials in undisturbed till, the till fabric, shows that at most localities the imbedded stones tend statistically to lie so that their long axes are parallel to the direction of glacier flow at the time of deposition. In a few localities the dominant statistical preference is for alignment at right angles to that direction. Presumably the parallel orientation was normally acquired by sliding, and the transverse orientation by rotation, and permanent deposition commonly occurred without loss of alignment. Fabric analyses indicate that stones of certain forms and degrees of roundness (enumerated in text) have a greater-than-average statistical chance for deposition either parallel to, or transverse to, the direction of transport. Such stones thus serve as guides to the direction of glacier flow and are independent of other evidence. Characteristic depositional attitudes of certain types of till stones permit inferences regarding the probable nature of the transportational environment.

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