MAIN MORAINIC SYSTEM OF THE SCIOTO LOBE. 393 



the view that this portion of tlie district is a shoulder rather than a distinct 

 lolie. By tliis interpretation the moraine here in its weakly developed por- 

 tion is lateral rather than terminal. Farther east the striae bear southward 

 or at right angles to the moraine, so that the moraine is there terminal 

 in its position, and its strength is greater than where lateral. West of the 

 reentrant angle, near Lexington and Iberia, striae bear obliquely toward 

 the moraine, but it is nevertheless strong, the movement in the main lobe 

 being more vigorous than that on the shoulder. The variations in the 

 strength and direction of ice movement seem therefore to afford ample 

 cause for such variations in the strength of the moraine as are displayed. 



In the midst of the elevated district lying southeast of Mansfield there 

 is a small tract known as Chestnut Ridge, on which careful search along- 

 several routes failed to disclose any drift. It takes the form of a narrow 

 neck abotit 3 miles in width and 10 or 12 miles in length, which extends 

 from Mohican Creek, just above Grreersville, westward nearly to Independ- 

 ence. Its altitude is scarcely 100 feet greater than that of districts border- 

 ing it on the north and south, being about 1,400 feet above tide, and it is 

 somewhat lower than drift-covered hills lying northwest of it, which in 

 some cases reach an altitude about 1,500 feet above tide. These hills to 

 the northwest, however, are not heavily glaciated, the drift being but a few 

 feet in thickness, and showing little tendency to aggregation in knolls. 

 Around this tract of thin drift curves the moraine under discussion, the 

 trend being from south of east to north of west on its north side, north to 

 south on its west side, and north of Avest to south of east along its south 

 side. On the meridian of Mansfield the distance from the portion of the 

 moraine on the north to that on the south of this tract of thin drift is 10 or 

 12 miles; but on the meridian of Perry sville, 10 miles east of Mansfield, the 

 distance is but 5 or 6 miles, and at the Mohican Creek it is scarcely 4 miles. 

 The space is so narrow in this eastern portion that Wright and Wooster 

 each connected morainic features on the south with those on the north. 

 Thus, Wright carried the glacial boundary from near Greersville northward 

 to the mouth of Lake Fork along the west side of Mohican Creek, ^ and 

 Wooster carried the moraine from Fredericktown direct to Perrysville." 

 Taking into consideration the bearing of the strise, the position of the thin 



1 See Glacial Boundary in Ohio, by G. F. Wright, 1884. 



^See map (PI. XXXI) accompanying Chamberlin's paper in Third Annual Report, U. S. Geol. 

 Survey, 1883. 



