Geology of the Lakeshore Preserve - continued
This slide shows how the glaciers shaped the landscape of much of Dane County. The hill in Eagle Heights (EHH) is one of many elongate hills formed by the sliding motion of the glacier. It is composed of till over bedrock that is fairly close to the surface. (Slide #11 shows an outcrop of this ancient bedrock). These hills are called drumlins, and there are thousands of them in southern Wisconsin.
Bascom Hill, Observatory Hill, and the hill the Capitol sits on are also drumlins, but they are composed of till over sand and gravel instead of rock. There are no drumlins in southwestern Dane County where the glacier did not reach.