Wisconsin Drumlins
March 15, 2005
Provided and copyright by: Dale Chadwick
Summary authors & editors: Dale Chadwick; Jim Foster
The photo above was taken over southeastern Wisconsin from a commercial jet on the morning of February 18, 2005. The early morning sunlight (7:21 a.m. Central Standard Time), shadowing on the western side of the oriented hills and the drifted snow on the eastern side of these hills, act to enhance subtle geologic features. These streamlined hills are called drumlins and are evidence of past glacial deposition. They formed beneath moving glacial ice and parallel the direction the ice once flowed. They're typically about 8-60 m (25-200 ft) high, several hundred m in width and perhaps 1 km or more in length.
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