Pleistocene Stratigraphy And Geomorphology Of The Bridgeport Terrace Of The Lower Wisconsin River Valley Near Muscoda And Blue River Wisconsin PDF Download

Excerpt from The Pleistocene History of the Lower Wisconsin River: A Dissertation The Wisconsin River, rising among the glacial lakes in the northern part of the state of Wisconsin, flows almost due south nearly to Portage, where it turns and flowing westward for a dis tance of about 80 miles joins the Mississippi just south of Prairie du Chien (fig. I). It is this lower, east-west part of the river valley which is discussed in this paper'. The terminal moraine of the Wisconsin glacial epoch crosses the valley just east of Prairie du Sac and marks not only the eastern boundary of the region here considered but also that of the driftless area. Since glacial drift is found in Iowa opposite the lower end of the valley, it may be said that the Wisconsin River traverses from east to west the entire driftless area. It is thus seen that drift remnants which are found in this part of the valley are of important significance in the history of ancient ice invasions in bordering regions. These remnants of glacial drift in the valley fall naturally into two divisions: First, there are terraces of Wisconsin age: (a) remnants of the valley train Sloping from the terminal moraine, where it crosses the valley near Prairie du Sac, to the Mississippi River, and (b) a lower terrace standing only I 5 feet above the pres ent river flood-plain; and second, standing well above the preced ing terrace, are rock benches covered with much older drift. These upper benches have a gentle slope toward the east (fig. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This 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.