INHEK BORDER OF THE SCIOTO LOBE. 347 



BO'NVTjDERS. 



There are few bowlders either on the moraine or on the inner border 

 plain, bnt what is lacking- in nnmber is partly made good in size. A gneiss 

 bowlder on the farm of the Clinton Connty infirmarjr, about 200 yards 

 south of the Wilming-ton and New Vienna pike, measures 47 feet in circum- 

 ference 1^ feet above its base. Its highest point stands 9 feet 8 inches 

 above ground, and it is evidently sunk into the ground to some depth. It 

 has a diameter from north to south of neaily 20 feet, but from east to west 

 it is scarcely 10 feet. It contains a few very coarse crystals of feldspar 

 several inches in diameter, and coarse masses of quartz, but the crystals are 

 genei'ally fine. A short distance south of the crossing of the Midland Rail- 

 way by the Wilmington and Cuba pike, there is a limestone bowlder 11 or 

 12 feet long and 6 or 7 feet wide standing about 1 foot above ground. It 

 contains Favosites and cyathophylloid corals (species and geological horizon 

 not determined). A number of small bowlders 1 to 2 feet in diameter, 

 mainly granite, were observed between Cowans Creek and Cuba. They 

 are more numerous there than elsewhere on this moraine, but they consti- 

 tute no serious hindrance to the cultivation of the soil. Nearly all the 

 bowlders observed are well rounded; this is especially true of the smaller 

 ones. Pebbles are generally quite rare on this moraine to a depth of a 

 foot or more, but the moraine has not such a continuous deposit of silt as 

 occTirs on the outer border plain. 



INNER BORDER PHENOMENA. 



In Greene County there is a plane tract between the Cuba moraine and 

 a neighboring later moraine. In Clinton County there is a generally plane 

 sui-face between these moraines, but just east of Wilmington there is a 

 small drift ridge trending from northwest to southeast. It has a more or less 

 distinct continuation in both directions, but joins the Cuba moraine at the 

 northwest in northwestern Clinton County, and at the southeast a short 

 distance southeast of Wilmington. Its surface is about 30 feet above the 

 tracts east and west of it, where the Washington and Wilmington pike 

 crosses, but as a rule it is scarcely so prominent. Its width where most 

 prominent is less than a mile. The surface of the crest is gently undu- 

 latory, with oscillations of 10 to 15 feet, more or less. These undulations, 

 tliouo-h slig-ht, are in contrast with those of the smoother till tract on 



