T. C. Chamberlin — Correlation of Terminal Moraines. 97 

 of the coast and 



character of the glacial margin prevailed thus much farther 

 east, and as that character is manifestly due to topographical 

 ■ becomes all the more remarkable that in the more 

 diversified region of the east, the glacial outline should become 

 more nearly uniform and rectilinear, as determined by the 

 geologists of that region. 



In New York, morainic accumulations identical in character 

 with the class under consideration have an extensive develop- 

 ment, but their relations and connections are not yet fully de- 

 termined. The more pronounced character of the topography 

 manifestly made itself felt upon the margin of the ice, and 

 gave rise to local modifications, and seemingly to independent 

 local moraines that increase the difficulties of a safe interpreta- 

 tion. But it is certain that, in part, the main morainic accu- 

 mulations are considerably removed from the margin of the 

 drift, and indicate that alternate divergence and approach may 

 be found to characterize the region lying east of the point of 

 first contact. In view of the fact that the wide separation in 

 the Mississippi Valley is entirely closed in eastern Ohio, the 

 suggestion that the later advance actually passed beyond the 

 earlier in the coast region, may be worthy" of entertaining as a 

 working hypothesis. It may be further remarked that if there 

 be alternating contact and divergence of the margins of the 

 glacial sheets, that a considerable belt lying back from the 

 uires investigation. 



r the further fact that the great moraine of the in- 

 terior is found throughout the wide extent through which it 

 tias been traced, to be persistently disposed in loops, the pre- 

 sumption of a similar outline, attended by reentrant angles 

 and intermediate moraines, ought only to be dismissed when 

 found unsupported by evidence after diligent search. 



It is hoped that the foregoing suggestions at this stage of the 

 , while yet final conclusions are unformed and 

 opinions still plastic, may not be without service to the in- 

 creasingly large number of workers in this somewhat new 

 field. * 

 Am. Jour. Sci.— Third Series, Vol. XXIV, No. 140.— August, 1882. 



