Classification of stratified Drift on the Basis of Position Extraglacial Deposits Supermorainic deposits The submorainic (basal) Deposits Intermorainic stratified Drift Changes in Drainage effected by the Ice While the Ice was on Wisconsin Lake Baraboo Lake Devil's Lake in glacial Times After the Ice had disappeared Lakes Existing Lakes Changes in Streams Skillett Creek The Wisconsin The Driftless Area Contrast between glaciated and unglaciated Areas Topography Drainage Mantle Rock LIST OF ILLUSTRATIONS. ------------------------------------------------------------ PLATES. Plate Frontispiece. The Dalles of the Wisconsin I. General map of the Devil's Lake region II. Local map of the Devil's Lake region III. Fig. 1--Ripple marks on a slab of sandstone Fig. 2--Piece of Potsdam conglomerate IV. Lower Narrows of the Baraboo V. Devil's Lake notch VI. East bluff of Devil's Lake VII. East bluff at the Upper Narrows of the Baraboo near Ableman's VIII. Vertical shear zone face of east bluff at Devil's Lake IX. Massive quartzite in situ in road through Upper Narrows near Ableman's X. Brecciated quartzite XI. Northwest wall of the Upper Narrows XII. Steamboat Rock XIII. Fig. 1--A very young valley Fig. 2--A valley at later stage of development Fig. 3--Young valleys XIV. Fig. 1--Same valleys as shown in Pl. XIII, Fig. 3, but at a later stage of development Fig. 2--Same valleys as shown in Fig. 1 in later stage of development XV. Diagram illustrating how a hard inclined layer of rock becomes a ridge in the process of degradation XVI. Skillett Falls XVII. A group of mounds on the plain northwest from Camp Douglas XVIII. Castle Rock near Camp Douglas XIX. Fig. 1--Sketch of a young valley Fig. 2--Same valleys as shown in Fig. 1 in later stage of development XX. Fig. 1--Sketch of a part of a valley at a stage of development corresponding to the cross section shown in Figure 21 Fig. 2--Sketch of a section of the Baraboo valley XXI. Cleopatra's Needle XXII. Turk's Head XXIII. Devil's Doorway XXIV. Talus slope on east bluff of Devil's Lake XXV. Dorward's Glen XXVI. Natural Bridge near Denzer XXVII. The Navy Yard XXVIII. Chimney Rock