This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1904 Excerpt: ...rock. This report was not verified, but, if it is correct, it indicates that considerable filling remains in the bottom of the gorge, and that the rock cut can not be correlated with the development of the Turtle Creek outlet through the Darien moraine. East of the head of this rock gorge three distinct stages may be ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1904 Excerpt: ...rock. This report was not verified, but, if it is correct, it indicates that considerable filling remains in the bottom of the gorge, and that the rock cut can not be correlated with the development of the Turtle Creek outlet through the Darien moraine. East of the head of this rock gorge three distinct stages may be traced in the development of the topography now seen. At the first the upper terrace or main gravel plain was formed, as previously described. North of Turtle Creek this has been but little modified by subsequent erosion. South of the creek, to the border of the older drift area, only remnants of these high-level gravels remain. One of these, a terrace varying in width from one-half to 1 mile, borders the moraine front. Parts of this terrace retain the original elevation, but more or less erosion has occurred. Except for these remnants, over an area of nearly 8 square miles, lying mostly south of the creek, these gravels have been removed to a depth of 20 to 50 feet, forming a gently undulating plain that distance below the level of the upper terrace north of the creek. This erosion appears to have been accomplished between the time of the withdrawal of the ice front from the Darien moraine and its subsequent retreat from the Elkhorn moraine. A glimpse of the relations of the upper and lower terraces may be had in PI. VII, B. This view was taken in eastern Rock County, where the Chicago, Milwaukee and St. Paul Railway passes from one terrace to the other. The top of the cut in the left foreground marks the level of the upper terrace. From this the surface drops down 30 to 40 feet to the right, in a steep erosion slope, to the lower terrace, which is seen in the right background. The lower terrace continues northeastward as the bottom of the Tur...
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