T. C. C%amlerlin— Correlation of T> rm had Moraines. 93 



AKT. Xll.—The Bearing of some Recent Determinations on the 

 Correlation of the Eastern and Western Terminal Moraines; 

 by Professor T. C. Chamberlix. 



For several years a group of geologists of the interior have 

 been engaged in tracing out an extensive range of terminal 

 moraines. This may be said to have become a definitely 

 organized movement, and to have already accomplished, so far 

 as the interior is concerned, its main purposes, though many 

 details remain to be worked out. The character and brevity 

 of this note forbid any attempt to set forth in detail the 

 respective parts played by the different investigators who 

 have contributed to this work. In a paper entitled, "On the 

 Extent and Significance of the Wisconsin Kettle Moraine," 

 presented to the Wisconsin Academy of Sciences, in February, 

 1875 (printed in 1878), the writer' attempted to collate arid 

 duly accredit everything published at that time having any 

 specific bearing on the subject, whether definitely recognized 

 as such by the authors or not. To a considerable extent the 

 correlation and interpretation of the investigations of others 

 were based upon personal visitation of characteristic and sig- 

 nificant portions of the formation in the seven interior States 

 traversed by the moraine. Of the much more considerable 

 work which has been done since, the writer hopes to find an 

 early opportunity to speak fully. 



The result of these investie'at'ions 'has been the determination 

 ofamorainie belt of extraordinary extent and character. It 

 traverses portions of Ohio. Indiana." Michigan, Illinois. Wiscon- 

 sin, Minnesota, loua and Dakota, and extends a distance, as 

 yet undetermined, into the British Possessions. Presumably it: 

 crosses the continent. It will be convenient to speak of this as 

 a single moraine, though in reality it is a complex range, 

 formed of two principal and one or more subordinate morainic 

 ranges, which sometimes coalesce and sometimes separate, so 

 as to embrace a belt twenty or thirty miles in width. * 



It is important to our present purpose to observe three 

 salient facts that characterize it. 



1. Instead of pursuing a somewhat direct course across the 

 country it is disposal i„ lar<je loops irhirh have for their axes the 

 tjre-At vo/ko/s of tin ■ mh-rior. 'These loops represent, the margins 

 of great glacial lobes that (ringed the greater ice-sheet of the 

 north. Of the ten great lobes now determined, one occupied 

 each of the following valleys, viz: of the Dakota River, of the 

 M • - \{ i -'. p ctioi o L ike Superior, 



of the Chippewa River, of Green Bay, of Lake Michigan, of 

 of t e Maumee. <>1 t e Scioto, and of the Grand 



