MAIN MORAINIC SYSTEM IN THE GRAND RIVER LOBE. 439 



the two lobes, as already indicated, is less clearly shown, since no stripe 

 have been discovered within the moraine, and there is no continuous gravel 

 plain traversing its midst from north to south. 



Grravel terraces lead from the interlobate moraine southward along the 

 several streams which have their source in it, viz, the Tuscarawas River 

 and the branches of Nimishillen Creek, the head of the terrace being near 

 Canal Fulton on the Tuscarawas River, and near Middlebrauch and New 

 Berlin on the middle and west branches of Nimishillen Creek. Farther 

 north the moraine incloses several lakes which are sometimes connected 

 into a chain by a series of marshes and gravel plains, but have either narrow 

 outlets or are without outlets to the southward-flowing streams. Hence 

 their significance is not clear. It seems probable that a shifting of the 

 margin of the ice sheet or of the line of coalescence between the lobes had 

 blocked up drainage lines that led southward, and left portions of the 

 channels unfilled. It is not improbable that by more detailed and critical 

 study of the features and the structure of the interlobate tract, there will be 

 found sufficiently clear evidence to justify a decision as to overriding or 

 shifting of the ice margin. 



RANGE IX ALTITUDE. 



The course of this moraine being over prominent ridges and deep 

 valleys on the western slope of the Alleghenies, there is a great range in 

 altitude. 



The following table of altitudes along the portion of the moraine in 

 Ohio and Pennsylvania is- based largely upon barometric readings, but 

 few accurate level's being available. 



Altitudes along outer moraine. 



Highlands east of Conewango River 

 Conewango Valley, at Eussellburg . 



Highlands west of Russellburg 



Chandlers Vallej' 



Highlands east of Wrightsville 



Wrightsville 



Highlands west of Wrightsville 



Feci. 

 2,050 

 1,233 



1,950 

 1, 450 

 1,900-1,980 

 1,350 

 1,900 



Carll. 



Dunkirk, Allegheny Valley and Pittsburg 



R.E. 

 Barometric. 

 Barometric. 



Pike Rock, 1,980 feet, barometric. 

 Barometric. 

 Barometric 



