T. C. Chamberlin— Correlation of Terminal Moraines. 95 



Meanwhile the inve-te_ratioi - <»f the ,■ rir-T. which have been 



pressure of other duties, since 1873, have developed some evi- 

 dence having an important bearing on the correct correlation 

 of the eastern and western moraines. In the paper above 

 referred to attention was called to the fact that, while in the 

 immediate Mississippi valley the kettle moraine lies some hun- 

 dreds of miles back from the drift margin, in Ohio it 

 approaches it much more closely, and this fact was adduced in 

 support of the presumption that the kettle moraine might 

 become marginal to the drift area somewhere farther east. 



In the reports of the geological survey of Ohio a series of 

 peculiar drift accumulations, consisting largely <>t gravelly lulls. 

 the water-shed between the Ohio 

 and Lake Erie. The identification of these with the kettle 

 moraine made* on the basis of the descriptions of the several 

 geologists who have taken account of them, interpreted in the 

 light of some personal observation, is in the main confirmed by 

 further investigation. But, whatever may be true of the 

 kame-like gravelly hills, the course of the moraine diverges 

 quite widely from the summit line of the water-shed. In con- 

 formity to its habit, it is disposed in loops, one of which has for 

 its axis the Maumee valley, another the Scioto, and a third, in 

 eastern Ohio, with which we are more especially concerned, 

 the Grand River valley. It is worthy of note that these axes 

 correspond to the three hydrographic sections of Lake Erie, as 

 marked by its surface outline, but more significantly by the 

 soundings of the Lake Survey. 



The interest which attaches to the eastern loop in its bear- 

 ing upon the correlation of eastern and western moraines lies 

 in the fact that in its southern portion it constitutes the margin 

 of the drift-bearing area. Its geography may be briefly 

 sketched as follows: Beginning with the eastern marginal 

 moraine of the Scioto lobe, in the southwestern corner of 

 Stark Co., it pursues a north-northeasterly course to the north- 

 ern part of Portage Co. In this portion, the moraine attains a 

 more pronounced development than in adjacent regions, and 

 has been made the basis of the descriptions and illustrations of 

 Dr. Newberry f and Colonel Whittlesey .% In this it conforms 

 to a law observed to be widely prevalent in its westerly exten- 

 sion, viz: that the reentrant portions lying between two glacial 

 lobes have a stronger development, and are more especially 

 characterized by the knob-and-basin features, and gravelly 

 constitution, than those portions which were -imply marginal 

 * Paper cited, pp. 21-25. + Geol. Survev of Ohi«>. vol. h. pp. 41-1*'.. 



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