Figure 17.30
Drumlins. (A) Drumlins are hills shaped by a moving ice sheet that are composed mostly of clays. They are no higher than 50 m (160 ft) and a few hundred meters in length. The tapering end of the drumlin points in the direction the ice was flowing. (B) Drumlin fields, such as this one in Dane County, in southern Wisconsin, cover portions of southern Canada and the northern United States. The ice sheet movement direction was toward the viewer.(B. © Kevin Horan/The Image Bank/Getty Images)