Boone County topographic map
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About this map
Name: Boone County topographic map, elevation, terrain.
Location: Boone County, Illinois, United States (42.15233 -88.94059 42.49502 -88.70559)
Average elevation: 260 m
Minimum elevation: 214 m
Maximum elevation: 324 m
Unlike most of Illinois, much of Northern Illinois was not submerged in a shallow prehistoric sea. As a result, bedrock found in the area now bounded as Boone County is almost entirely Ordovician, as opposed to nearby counties like McHenry and Carroll which contain large areas of later Silurian bedrock. Till and outwash from the Illinoian glaciation covers area bedrock to a depth of several hundred feet. The county's proximity to the driftless area protected the region somewhat from the more recent Wisconsin glaciation. As a result, the county's northern townships resemble a driftless-like area, with higher peak elevations and more surface detail compared to the southern townships dominated by the broad flood plains of the Kishwaukee River and its tributaries.
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