Groundwater Geology of Lee and Whiteside Counties, Illinois (Classic Reprint)

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Excerpt from Groundwater Geology of Lee and Whiteside Counties, IllinoisStratified bedrock formations consisting of dolomite (a limestone-type rock), shale, and sandstone occur below the drift throughout the counties. The top Of the buried rock is not smooth because for mil lions oi years it was exposed to the same forces of erosion as the present land surface. The bedrock surface has its own uplands and valley lowlands. These ancient buried valleys in many cases contain large water bearing sand and gravel deposits. Enor mous reservoirs of groundwater occur in such buried valleys as those Of the ancient Mississippi and Rock rivers. The courses of these abandoned and buried valleys bear little relation to the river courses on the present landscape.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.