Results of a study of the preferred orientation of stones and the directions of long axes of sand and silt particles of the four tills exposed in coastal areas of east Yorkshire (England) indicate that the Pleistocene Saale and Weichsel ice sheets moved from northeast to southwest and that the three Weichsel tills were deposited from a single composite ice sheet. Some of the directions observed in the Saale till reflect pressures exerted by advancing Weichsel ice; some observed in the lowermost of the Weichsel tills probably represent post-depositional conjugate shear joints.