MAIN MORAINIC SYSTEM OF THE MIAMI LOBE. 359 



its. From Sevenmile Creek northwestward into Indiana the moraine 

 presents a main ridge standing- 15 to 30 feet above the outer border plain, 

 on whose crest and slopes there are small knolls and ridges. The outer 

 portion of the moraine has a uniformly undulatory surface, while the inner 

 slope has clusters of knolls around which the surface is nearly plane. 



In northern Wayne and northeastern Henry counties, Indiana, groups 

 of knolls occur, but at least half the surface is very gently undulating. The 

 highest knolls are only about 2h feet in height, but some of them appear 

 prominent because of very abrupt slopes. 



Returning to the Great Miami Valley and taking up the middle mem- 

 ber, we find it crossing the stream just above Dayton; indeed, its outer border 

 extends into the northwest portion of the city, known as Dayton View. It 

 is well developed near the mouth of Stillwater River, where it consists of 

 gravelly knolls rising to a height of 25 to 40 feet above the river bottoms. 

 The moraine is feebly developed on the uplands between the Stillwater 

 and Miami south of Chambersburg, consisting of low swells 10 feet or less 

 in height, on which bowlders are numerous. On the highlands west of 

 Dayton, in the vicinity of the Soldiers' Home, the moraine has very feeble 

 development, but southwest of these highlands, in the lowland tract south 

 of Liberty, it is well defined, with knolls closely aggregated and thickly 

 strewn with bowlders. The height of the knolls is slight, being but 10 or 

 15 feet., From this lowland tract northwestward to Ebenezer (near the 

 State line) the moraine has scarcely any knolls exceeding 15 feet in height, 

 and but few have sharp contour. The largest and sharpest knolls observed 

 is a group 3 miles northwest of Eaton, which contain knolls 20 feet in 

 height. Along the outer border are many bowlders, but the topography 

 there is often less sharply morainic than it is a mile or so north of the 

 bowlder belt. For several miles east of the State line and throughout much 

 of its course in Indiana this member has a strong expression, containing 

 knolls 25 to 30 feet in height, among which are basins and irregular depres- 

 sions, the surface being thickly strewn with bowlders. Its expression is 

 stronger than the portion of the outer member adjacent to it on the south 



The inner member of this morainic system is represented in eastern 

 Indiana and western Ohio by irregularly grouped drift knolls of sharp con- 

 tour, separated by wide stretches of nearh^ plane-surfaced drift, all liberally 

 strewn with bowlders, though not in such numbers as the middle member. 



