310 GLACIAL FORMATIONS OF ERIE AND OHIO BASINS. 



as tlie Hartwell moraine. It is probable that for 5 or 6 miles south from 

 Spring Valley the Miami portion of the interlobate moraine lies between 

 Cajsars Creek and the Little Miami River, while the Scioto portion lies east 

 of the creek, the position of the creek being determined to some degree by 

 this relation to the ice lobes. 



East and south of Lebanon low swells occur on the slopes of the pre- 

 glacial ridges and in valleys or' lowland tracts, but the moraine is rather 

 hiconspicuous. It is strikingly in contrast with the neighboring portion in 

 Turtle Creek Valley, which for about 3 miles above the mouth of the creek 

 has so many sharp swells and gravel knolls that the valley is nearly filled. 

 The highest are but 40 to 50 feet, and many are only 15 to 20 feet in 

 height, but they are closely aggregated and constitute a noticeable feature. 

 They have forms independent of the drainage, present or past, and connect 

 here and there in the irregular and peculiar manner common to moraines. 



About 3 miles above the mouth of Turtle Creek the valley becomes 

 free from knolls and contains a broad, swampy lowland plain about a mile 

 in width. This plain passes northwest into the Great Miami drainage basin, 

 the lower course of Dicks Creek, a tributary of the Great Miami, lying iu 

 it. The freedom from knolls gives this portion of the valley or lowland 

 strong contrast with the portion occupied by the moraine. This lowland 

 tract, which was first discussed by Orton in a report of the Ohio geological 

 survey,^ appears to be a line of preglacial drainage, as noted in Chapter III. 



On the upland tract between the Little Miami River and Mill Creek, 

 in southwestern Warren, southeastern Butler, and northern Hamilton coun- 

 ties, no very prominent knolls were observed, but the surface has many 

 swells with gentle slope, and the drift is sufficiently heavy to greatly mask 

 the preglacial valleys and ridges. In the vicinity of Pisgah the drift has 

 unusual thickness as well as altitude, and there are knolls of morainic type 

 10 to 20 feet in height. They cover but an acre or two each. Such drift 

 knolls continue down the slope into Mill Creek Valley at SharonAdlle. West 

 of Pisgah, in the vicinity of Westchester, there are some larger drift knolls. 

 One just west of the Cleveland, Columbus, Cincinnati and St. Louis 

 Railway and north of the Westchester and Pisgah wagon road is 60 feet 

 or more in height. It is in a lowland tract, as are nearly all the other 

 prominent knolls near Westchester. 



1 Geology of Ohio, Vol. Ill, 1878, pp. 381-382. 



