The Delavan Lobe of the Lake Michigan Glacier of the Wisconsin Stage of Glaciation and Associated Phenomena Volume 34-35 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1904 edition. Excerpt: ...north of the lake much of the great thickness of drift may be the remains of older sheets. The exposure of reddish till, like that of the older drift area, in the slopes north of the lake has raised a suspicion that the ridge there may le largely of older drift, especially as the older and later drift come into closest proximity, with but little intervening outwash, immediately to the west and southwest of the hike basin. This can not, however, be regarded as very good evidence, since the origin of the reddish coloring matter of the drift in this region was apparently the red beds of the lower part of the Niagara formation, which are found just beneath the drift in the vicinity of Lyons and Burlington, directly to the east of Delavan Lake, and the contributions of red material were to both the older and the later drift. The elevated tract between this lake basin and Lake Geneva is regarded as probably due to the burial of the northwestward extension of the Marengo Ridge. During the early Wisconsin glacial invasion, while the glacial front stood at the Marengo Ridge as a terminal moraine, the water from the melting ice would le discharged into the lower area to the northwest and west, and would now otf thence to the south through Troy Valley. If the valley north of the site of the lake was largely blocked with drift, the waters would be confined to a distinct channel bordering the moraine, where they would scour out rather than make any considerable deposits. Considerable water may also have come from the northeast, near the morainal front along the line of Jackson Creek Valley, the northeastward extension of the lake basin. When the later invasion of the Wisconsin stage took place the Delavan glacial lobe advanced over this area, ..