MAIN MOEAINIC SYSTEM OF THE SCIOTO LOBE. 405 



tivel}^ thin deposits of drift, there being numerous outcrops of sandstone on 

 the large ridges. The thickness probably averaged no more than 25 feet; 

 but an abandoned valley connecting the streams along the line of the Pitts- 

 burg, Fort Wayne and Chicago Railway is deeply filled with drift, wells 

 having reached a depth of 185 feet without entering rock (Todd). 



Along Lake Fork the terraces fill the valleys in places to a height of 

 fully 100 feet above the present stream, and it is not improbable that the 

 drift extends considerably below the present stream bed. A gas-well 

 boring at Loudonville with about 150 feet of drift, entered rock at an altitude 

 fully 50 feet lower than that of the bed of the creek at its nearest 

 approach to the village. The drift consists of gravel at surface, while sand 

 constitutes the main part of the section. A boring for water at Peter 

 Long's, in Loudonville, penetrated 125 feet of drift without entering rock. 



In the vicinity of Perrysville the drift is heavy, but no records of deep 

 wells were found to show its full depth. There are knolls 50 feet or more 

 in height, and tlie crest of the moraine south of the village rises about 150 

 feet above the level of Black Fork. It is probable that the thickness is 

 even greater than the height of the moraine above the creek. In a tribu- 

 tary of Black Fork, 3 miles north of Perrysville, a well at Mr. George 

 Hay's penetrated 150 feet of drift without reaching rock, and George 

 Maurer's well, on the adjoining farm, stiikes no rock, thoug'h 115 feet deep. 

 Near the northern end of the reenti'ant portion of the moraine north of 

 Mansfield, a well in Black Fork Valley, at David Forkler's, penetrated 180 

 feet of drift without reaching rock. In the lowland tract in the north part 

 of Mansfield a gas-well boring penetrated 250 feet of drift, striking rock 

 at an altitude about 900 feet above tide. The waterworks plant in this 

 lowland has several wells 100 to 140 feet in depth, some of which reach 

 rock. In the business portion of Mansfield, on the slope north of the public 

 square, there are outci'ops of rock at an altitude of about 1,200 feet. 

 Many of che ridges and hills in the vicinity of Mansfield have but a small 

 amount of drift, though all seem to have been glaciated. 



THE EASTERN LIiME OP THE MAIN LOBE. 



At Lexington, in the valley of Clear Fork, near the outer border of 

 the moraine, wells 100 feet deep do not reach the bottom of the drift, but 

 on the bordering uplands the general thickness is only 30 or 40 feet. The 

 highland tract in southern Richland County was crossed by the writer 



