OO THE PREGLACIAL DRAINAGE OF OHIO. 



From Fosters south the valley widens fairly regularly to a 

 short distance below Milford. Everywhere the stream flows 

 over drift. At Loveland a well 35 feet deep passed through two 

 thin ledges of limestone, thus showing that the drift at that place 

 is not deep. Below Loveland the quantity of drift increases. 

 At Miamisville the gravel forms a terrace 62 feet high on which 

 the village is located. Just below Camp Denison the Miami has 

 abandoned its old course, and now occupies a channel farther 

 east which is separated from its former valley by a knoll of lime- 

 stone. Just south of this place is the town Milford, which, in 

 the language of Dr. Orton, "stands on an island of blue lime- 

 stone" and is surrounded on all sides by deep channels of erosion. 

 The old valley of the river lies to the north and east of the town. 

 These changes may be the result of the heavy deposits of drift 

 which clog the valley in this vicinity. 



A mile and one-half south of Milford another marked 

 change occurs in the character of the valley. At that point 

 East Fork of the Miami unites with the river, and immediately 

 there is a decided increase in the width of the Miami valley. 

 East Fork has in places a valley a mile or more in width, and 

 lies 200 feet below the general upland. The valley of the Miami 

 below the mouth of East Fork is comparable with the valley 

 of the latter, but not with the valley of the Miami above the 

 point of junction. These relations indicate that the Miami val- 

 ley below the place of junction is really a continuation of the 

 valley of East Fork, and that the breadth of the former is really 

 due to the work of East Fork long before the present Miami 

 was born. In those early days a tributary whose headwaters 

 were near Fosters flowed south through the valley of the present 

 Miami, and united with the waters of East Fork where this 

 stream now unites with the Miami. 



From this place to the junction with the Ohio the Miami 

 valley is everywhere prominent. At Newton, four miles below 

 Milford, it is more than a mile in width and it is several times 

 wider than the Ohio just below the point of junction of the 

 two rivers. These relations suggest important drainage mod- 

 ifications in the vicinity of Cincinnati, though it is no part of 

 the purpose of this article to discuss these. 



