41. Morainic outwash plain 42. The same in other relations 43. Skillett Creek and its peculiarities 44. The Wisconsin valley near Kilbourn city 45. Drainage in the driftless area 46. Drainage in the glaciated area 47. Section in the driftless region showing relation of the soil to the solid rock beneath PART I. ------------------------------------------------------------ THE TOPOGRAPHY. WITH SOME NOTES ON THE SURFACE GEOLOGY. GEOGRAPHY AND SURFACE GEOLOGY OF THE DEVIL'S LAKE REGION. CHAPTER I. GENERAL GEOGRAPHIC FEATURES. This report has to do with the physical geography of the area in south central Wisconsin, shown on the accompanying sketch map, Plate I. The region is of especial interest, both because of its striking scenery, and because it illustrates clearly many of the principles involved in the evolution of the geography of land surfaces. Generally speaking, the region is an undulating plain, above which rise a few notable elevations, chief among which are the Baraboo quartzite ranges, marked by diagonal lines on Plates I and II. These elevations have often been described as two ranges. The South or main range lies three miles south of Baraboo, while the North or lesser range, which is far from continuous, lies just north of the city. The main range has a general east-west trend, and rises with bold and sometimes precipitous slopes 500 to 800 feet above its surroundings. A deep gap three or four miles south of Baraboo (Plates II, V, and XXXVII) divides the main range into an eastern and a western portion, known respectively as the _East and West bluffs_ or _ranges_. In the bottom of the gap lies Devil's lake (i, Plate II and Plate XXXVII), perhaps the most striking body of water of its size in the state, if not in the whole northern interior. A general notion of the topography of a small area in the immediate vicinity of the lake may be obtained from Plate XXXVII. The highest point in the range is about four miles east of the lake, and has an elevation of more than 1,600 feet above sea level, more than 1,000 feet above Lake Michigan, and about 800 feet above the Baraboo valley at its northern base. The eastward extension of the west range (Plate XXXVII) lying south of the lake, and popularly known as the _Devil's nose_, reaches an elevation of a little more than 1,500 feet.