A review of experimental and theoretical data relating to the behavior of ellipsoidal objects in a moving viscous medium, together with results of field observations, lead to the conclusion that processes of free flow in moving ice can account for the principal preferred orientations exhibited by stones in till (long axes aligned parallel with, or to a lesser extent transverse to the direction of ice movement). Variations in the relative distribution of long axes may reflect collisions between stones, the mode of deposition from the ice, or post- depositional disturbance.
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Glen et al. (1957) studied this question.