112 PLEISTOCENE OF INDIANA AND MICHIGAN. 



The general width of this weak undulating belt is scarcely a mile, and few of the knolls 

 in it exceed 20 feet in height. Near its inner border, however, a mile west of Dayton, a sharp 

 knoll 60 feet high and a similar knoll east of the river form conspicuous landmarks. Basins 

 are not rare along its southern edge, and some stand in the supposed border drainage channel, 

 suggesting that the work in the channel was completed before the ice had entirely melted away. 

 The width of the drainage channel averages about a mile. The fact that the stream cut strongly 

 into the north slope of the part of Highgap Ridge bordering it is thought to indicate that the ice 

 border stood close by the ridge at the opening of this drainage, and that the channel broadened 

 with the melting back of the ice. 



FOWLER-LAFAYETTE BOWLDER BELT. 



In the north part of Lafayette the bowlder belt crosses Wabash River in a course a few 

 degrees north of west and south of east. On the west side of the Wabash it occupies the high 

 land between the West Lafayette reservoir and the Soldiers' Home and, covering a belt 1£ to 2 

 miles wide, runs westward past Montmorency and just south of Otterbien to the corners of 

 Benton and Warren counties at the west side of Tippecanoe County. Thence it continues 

 slightly north of west past Templeton to Oxford, where it turns northward to Fowler and con- 

 nects with an extensive bowldery area. 



East from Lafayette it lies mainly on the south side of Wildcat Creek to the mouth of 

 South Fork, though it has a small extension on the north side in sees. 12 and 13, T. 23 N., 

 R. 4 W. East of South Fork it lies on both sides of Middle Fork in the southeast part of T. 

 23 N., R. 3 W., its north border being within one-half mile north of Monitor and Petit post 

 offices. There is some uncertainty as to its continuation hi Clinton County, there being only 

 scattered knolls in the direct line of continuation and no apparent grounds for continuing the 

 ice border in an indirect course. 



The width of this bowldery belt is generally between 1 and 2 miles, and it is on the whole 

 better defined than the Stony Prairie belt. Like the latter it covers numerous small hum- 

 mocks. The drift is largely till of rather clayey texture. The border drainage is not so definite 

 as that along the Stony Prairie belt, and it is probable that the Wabash Valley and Indian 

 Creek valley each served as fines of drainage. On Indian Creek a gravelly terrace is 

 thought to mark such a line. On the Wabash gravel terraces are more conspicuous below 

 Lafayette than immediately above it, and an interbedding of outwash gravel and till at the 

 south edge of Lafayette seems to mark the passage from glacial to fluvioglacial deposits. 

 The gravel plain standing a few feet above the broad Wea Plain along its southern edge may 

 prove to be the outwash at the time when Stony Prairie was forming, but the connection with 

 that belt is not clear enough for satisfactory correlation. 



MINOR UNDULATING STRIPS. 



Four or five miles north of the Lafayette bowlder belt and running nearly parallel with it 

 in western Tippecanoe and eastern Benton County a tract of undulating land standing slightly 

 higher than the plane tracts north and south of it constitutes throughout much of its length a 

 water parting. Its eastern end is in northwestern Tippecanoe County near Octagon, whence 

 it passes northwestward across the southwest corner of White County and into southeastern 

 Benton County for about 2 mdes and dies out in a plain. The swells along this belt from 

 Octagon northwestward are 10 to 20 feet high, but few of them are steep, a rise of 20 feet 

 generally requiring fully one-eighth mile of slope. There is scarcely any level land in the belt. 

 In the vicinity of Octagon a tendency to ridging in an east- west direction was noted. 



The Octagon undulating tract is bordered by a sand ridge 5 to 15 feet high and 100 to 300 

 yards wide, composed of fine yellow sand, which sets in about 5 miles west of Brookston in 

 southern White County and leads southwestward for 10 mdes across the northwestern part of 

 Tippecanoe County into southeastern Benton County. Were the ridge of gravel instead of 

 sand it would seem best explained as an esker, but careful search faded to bring to light any 

 pebbly material in it. Were the bordering material sand instead of clayey till the ridge might 



