Drumlin Formation: A Rheological Model

Science  18 Mar 1966:
Vol. 151, Issue 3716, pp. 1379-1380
DOI: 10.1126/science.151.3716.1379


Drumlins are formed in a layer of boulder clay separating a glacier fronm certain types of terrain. Under certain conditions the large particles in the clay form a dilatant system. When flow in the separating layer is interrupted, part of the layer packs into an obstruction and the rest of the material flows around this obstruction, giving it a streamlined form.