ST. MARYS OR FORT WAYNE MORAINE. 567 



moraine itself is not visible, but is concealed or blanketed by a heavy deposit 

 of Erie clay, a deposit supposed at that time to have been of iceberg origin 

 and of much later age than the glacial drift. It is but fair to state that this 

 conception is now abandoned by its author, for subsequent studies failed to 

 disclose any essential difference in structure between the superficial and the 

 deeper portions of the drift, while the drainage phenomena show that at the 

 time these moraines were forming the altitude was so great as to render 

 inapplicable the theory of large inland seas in Ohio and Indiana. There 

 could, therefore, have been no extensive sheets of iceberg drift. The ques- 

 tions of the probable altitude of this region and the extent of lakes in it 

 are discussed on a later page. 



N. H. Winchell has included a descri^jtion of this moraine in a paper on 

 the surface geology of northwestern Ohio, already mentioned.' Dryer lias 

 given a description of the Indiana portion of the moraine in his report on 

 Allen County, Ind.^ 



DISTRIBUTION. 



As indicated above, the Fort Wayne moraine is closely associated with 

 the Wabash moraine from the interlobate tract west of the Grand River 

 Basin in northeastern Ohio westward to the Sandusky River near Upper 

 Sandusky. For a few miles west of Sandusky River there is scarcely any 

 development of morainic features, but near Dunkirk the Fort Wayne 

 moraine appears in strength and follows the north side of Ottawa River (or 

 Hog Creek) westward, determining the course of the river from Hog Creek 

 marsh in Hardin County to the bend just west of Lima. The moraine then 

 turns westward, crossing Auglaize River at Fort Amanda and coming to the St. 

 Marys at the bend near Kossuth. From Kossuth it follows the northeast side 

 of the St. Marys to its mouth at Fort Wayne, Ind. From Fort Wayne, as 

 outlined by Gilbert, its course is northeastward along the east side of the 

 St. Joseph River to the vicinity of Hudson, Mich., near the head of that 

 stream, beyond which its course and connections are not fully determined. 



From the Sandusky River eastward the moraine, where distinct from 

 the Wabash moraine, is usually but 1 to 2 miles in width. But on the 

 east side of the Sandusky River it has a spur which extends north 10 

 miles or more to the vicinity of the Defiance, or next later moraine. 



1 Proi;. Am. Ass. Adv. Sci., 1872, pp. 168-171. 



^Sixteenth Ann. Kept. Geol. Survey Indiana, 1889, pp. 114-11.5. 



