to be (le'scribed fartlier on. While it affords no section . i 

 moraine for examination, it yet confirms the general fact ^ 

 existence, Lj demonstrating that the superficial ridge li;- 

 no nucleus of rock in situ. With the exception of tlie ^h. 

 no stream crosses the moraine from near Hudson. ]\[icl::_ 

 .Fort Amanda, near Lima, Ohio, a distance of 83 jiiili's in :, 

 line and 120 miles on the line of the moraine. Beyond 

 points I have not traced it, but an inspection of the uki; 

 gests that it may be found along the upper waters of tlu' "\ 

 and Scioto rivers, as dotted in the accompanying chart, 

 would increase its leng-th and chord to 200 miles, and 12U w. 

 respectively. 



The courses of the Tiffin and Auglaize riversare ^etermiaL'; 

 by a more easterly, and so more recent, moraine of the same 

 system, but its form is less conspicuous, as this portion of the 

 valley has been greatly modified by lacustrine action. '\ iy 

 same agency has obliterated all superficial traces, if any exi- 



South of the St. Marys river are other and numerous ni< r: 

 accompanied by glacial striee. Their character and C' > 

 have not yet been "studied ; but their presence carries the i.... 

 back to an epoch of the cold period, when the margin of ;: 

 ice-field was farther south, and the glacier of the Maumee valley 

 was marged in the general mass. As the mantle of ice giw 

 shorter—and, in fiact, at every stage of its existence — its margin 

 must have been variously notched and lobed in conformity ^vitti 

 the contour of the country, the higher lands being first lam 

 bare by the encroaching secular summer. Early in the historv 

 of this encroachment the glacier of the Maumee valley consti- 

 tuted one of these lobes, and has recorded its form in the two 

 moraines that I have describecL 



II. That Lake Erie formerly had an outlet past Fort Wayne. 

 Indiana, and down the Wabash valley, has for some years been 

 recognized by local obser\'ers ;* but, as there is reason to 

 believe that the fact is as yet unpublished, an account ot it 

 will not be without interest to the public. I was led to mate 

 an examination of this outlet by its relation to certain cotem- 

 poraneous beach lines that I had occasion to examine and trace 

 in Ohio. 



The relation of the waters of the Great Lakes to t^^^ir shores 

 has undergone a series of changes since it was first estaDlisne , 

 by the recession or drainage of the iceberg-bearing sea, at i 

 close of the Drift period. Some of these changes appear^ 

 have been gradual and others comparatively sudden, while 



; the 



