MAIN MORAINIC SYSTEM IN THE GRAND RIVER LOBE. 459 



In northeastern Mercer County there is an extensive elevated tract in 

 which the drift is, as a rule, 30 feet or more in thickness. On its surface 

 bowlderets are very numerous. 



In Big' Sandy Creek Valley, at Polk Station (Waterloo), rock is struck 

 at about the level of the creek bed, the thickness of drift being- 30 to 45 

 feet. At Raymilton there are many borings for oil, and none of them show 

 an ancient channel excavated below the level of the present creek bed. 

 The greatest amount of drift penetrated in the village was in William 

 Raymond's borings, which are on a terrace about 50 feet above the level of 

 the creek. Two borings here penetrated 54 feet of drift. At James Winan's, 

 2^ miles above Raymilton, a boring near the creek passed through 87 feet 

 of drift, striking the rock floor about 20 feet below the level at Raymilton 

 In the village of Sandy Lake, Hugh Baird made a well on a drift knoll at 

 his residence, which did not reach rock at 120 feet. It was principally in 

 blue till. At Stoneboro, on the south side of Sandy Lake, a well at the 

 ice houses, 110 feet deep, did not strike rock, though it reached a level 40 

 feet below the level of the rock floor at Raymilton. From Sandy Lake a 

 swampy valley leads west to Little Sheuango Creek, whose summit is but 

 a few feet above the level of the lake. Were the drift removed at the 

 present divide its altitude would be lower than at Raymilton, and it is not 

 improbable that in preglacial times there was a divide near that village, 

 the valley being much naiTOwer there than at Sandy Lake. 



Along the Little Shenango the drift is of unknown depth. Mrs. Had- 

 ley's well at Hadley station, about 9 miles below the Sandy Lake Swamp, 

 is nearly 200 feet deep and reaches a level about 100 feet- below the creek 

 and 80 feet below the rock floor at Raymilton, yet strikes no rock. No 

 other records of deep wells along this stream were obtained. 



On the uplands in eastern Mercer County and one-half mile west of 

 Harrisville, near the outer border of the moraine, a well at Mr. Barnes's 

 residence, 25 feet in depth, does not strike rock. It penetrates 8 to 10 feet 

 of oxidized till, and then blue till to a depth of 23 feet, where a sand bed is 

 reached. About 50 rods east of this is the eastern border of the moraine, 

 and a rock ridge nearby rises to a height of 20 to 30 feet above the mouth 

 of Mr. Barnes's well. 



At Harrisville is a gravel plain formed as an outwash apron to the 

 moraine. In it wells obtain water at 12 to 15 feet. 



