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Excerpt from Economical Geology of Illinois, Vol. 3: Reprinted From the Original Reports of the Geological Survey, With Additions and Emendations; Published by Authority of the Legislature of Illinois, 1882
The glacial Drift period, and the tremendous forces acting through it, are not well understood by geologists, but they had much to do with the deposition and present arrangement of loose materials, covering the rocks concealed beneath them.
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