MISSISSINAWA MORAINE. 499 



As a rule the nioraine has stronger expression near tlie outer border 

 than on the inner. But in the vicinity of the Hue of Grant and Delaware 

 counties it is feebly developed near the outer border, while back 2 to 4 

 miles there are larger swells, 20 feet or more in height. Near Upland 

 there are swells 15 to 20 feet in height on the interfluvial tracts, and 

 30 to 40 feet high near the creek valleys. Here, as well as elsewhere in 

 Grant County, features were noted in the vicinity of creek valleys which 

 could not be the product of drainage erosion. The lowlands among the 

 swells expand and contract in width to suit the form given them by the 

 ice sheet. The postglacial streams have produced remarkably little 

 modification of the glacial topography. 



In Blackford County the moraine is crossed at nearlj^ a right angle by a 

 deep marshy valley leading southwestward from the Salamonie River near 

 Balbec past Hartford to the Mississinawa near Wheeling. It lias a breadth 

 ranging from one-eighth up to one-half mile. The sunn nit or water 

 parting in the valley is near the line of the crest of the moraine, but the 

 valley seems to have been deeply filled with peaty deposits there as well as 

 elsewhere along its course. The most probable hypothesis yet suggested 

 makes it the channel of a subglacial stream. Several other similar channels 

 occur in eastern Indiana, as noted above. 



In northern Grant and in Wabash County the moraine consists of swells, 

 few of which exceed 15 feet in height, that occupy the crest and slopes of a 

 ridge standing 30 to 50 feet or more above the plain west of it. In south- 

 ern Wabash County this ridge constitutes the divide between tributaries 

 of the Wabash and Salamonie rivers, and in northern Wabash County 

 between the Wabash tributaries on its east slope and Eel River tributaries 

 on its west slope. The sin-face is all more or less undulatory along the 

 moraine, though the knolls are of a subdued form and contrast perceptibly 

 with the plane surface west of the moraine. 



In the portion of the moraine which borders the great interlobate belt 

 there is a swell-and-sag topogra])hy with frequent oscillations of 10 to 20 and 

 occasionally 30 to 40 feet, the whole surface being more or less imdulatory. 

 The ])ortion traversing eastern Steuben County is also of this type, excepting 

 a small tract in the southeastern corner of the county, where a lakelet known 

 as Fish Lake occurs, which is surrounded by sharp knolls rising abruptly 

 40 to 50 feet or more above its surface. There are occasional shallow basins 



