Abstract

Fabric data from 10 basal till sites in New Hampshire indicate that the shape of a pebble exerts a strong influence on its orientation in the till. Using Zingg shape definitions, A axes of rods are well aligned in the ice flow direction; those of blades are less so. Spheres and discs have weaker fabrics which still trend parallel to the ice flow direction. The A axes of all shapes tend to be slightly imbricated. Detailed study of movements of the extreme shapes and transitions between them was made by further subdividing the four Zingg shape classes. Transverse fabrics appear to be produced neither by extreme rods nor highly prolate shapes, but by pebbles whose shapes are near the common intersection of the four Zingg shape classes.

First Page Preview

First page PDF preview
You do not currently have access to this article.