616 GEOLOGY OF CENTRAL WISCONSIN. 



gravel, with a number of depressions occupied by small lakes, one of 

 which, on Sec. 3, T. 5, II. 10 E., is a mile in length. The belt in these 

 towns has a width of about eight miles, and a course west of north. 

 In southwestern Dunn, T. 6, E. 10 E., and Fitchburg, T. 6, R. 9 E., 

 a bow is made to the westward, the convex side of which reaches the 

 northwest part of Oregon, where knolls and large well marked dry 

 kettles are to be seen, and the width is not more than from 4 to 6 

 miles. In southwestern Madison, T. 7, R. 9 E., the inner edge of the 

 belt reaches the western ends of Lakes Monona and Mendota, where 

 are finely marked mammillary knolls, rising 50 to 75 feet above the 

 lakes, and arranged in lines transverse to the axes of the lake valleys. 

 The western side of this part of the belt is on the high ground of 

 Middleton prairie, where kettles and knolls are to be seen at an ele- 

 vation of 300 and more feet above the Madison lakes. The same is 

 true of the low ground of northeastern Middleton, where is quite a 

 cluster of water-filled kettles. From Middleton the range passes into 

 Springfield, T. 10, R. 8 E., where the best development is in the 

 northwest corner, and the width is some four miles. The high divide 

 between the Wisconsin and Catfish rivers is crossed in the adjoining 

 portions of Springfield, Dane, T. 11, R. 8 E., Berry, T. 10, R. 7 E., 

 and Roxbury, T. 11, R. 7 E. In Roxbury the belt descends abrupt- 

 ly 200 feet into the low ground of the valley of the Wisconsin. Hand- 

 somely shaped and deep kettles are seen in Roxbury, on Sections 8, 9 

 and 16 in a low area, surrounded by eleven entirely isolated rock 

 bluffs, and two quite large kettle lakes are found on the north side of 

 the town. Columbia county is entered in the town of West Point, 

 T. 12, R. 7 E., where the same characters as observed in Roxbury 

 are continued. 



The Kettle Range crosses the Wisconsin river in the northern part 

 of the town of West Point, and continuing northward along the east 

 side of Sauk prairie, reaches the foot of the Baraboo bluffs in T. 11, 

 R. 6 E., and T. 11, R. 7 E., Sauk county. On top of the bluffs im- 

 mediately north of here it is not well marked, but in the gorge in 

 which lies Devil's Lake, and which makes a complete cut through the 

 range, are very large accumulations of drift materials. The lake it- 

 self really occupies a kettle depression, being held in position by im- 

 mense heaps of entirely unmodified drift at each extremity. These 

 hills rise over 100 feet above the surface of the lake, the southern one 

 falling off on the side away from the lake to over 150 feet, and tho 

 northern one fully 100 feet, below its level. The thickness of the 

 drift in the gorge must be nearly, if not more than, 300 feet It has 

 been shown on a previous page, that in this gorge we have, in all 



