BLANCHARD OR DEFIANCE MORAINE. 613 



will furnish a ready answer to tliis question. The solution is, however, not 

 so easy as might be expected, for the beach varies greatly in strength in 

 both districts. It is weak where the descent on the lakeward side is very 

 gradual, and comparatively strong where the descent is rapid. It so happens 

 that in much of the shore outside of the Defiance moraine the lake plain 

 has exceptionally slight descent, often but 5 to 10 feet per mile, while in 

 the part of the shore inside the moraine it is, on the whole, rather rapid. 



In so far as favorable conditions in one district exceed those in the 

 other a false impression of relative strength is likely to be gained. The 

 impression which the writer has obtained by comparing the portion of the 

 south shore of Lake Maumee outside the Defiance moraine with that inside 

 is that the latter is fully as strong as the former. But upon comparing the 

 northwest shore outside the moraine with that inside there was found to be 

 a decidedly stronger beach outside the moraine and that, too, where slopes 

 appear to be similar. The portion outside seems to have at least double 

 the strength of that inside. The study has not, however, been sufficiently 

 thorough to justify a more precise statement of the relative length of the 

 part of the upper lake stage involved in the deposition of the Defiance 

 moraine. It can only be stated that on the northwest shore it is sufficient 

 to cause a marked contrast between the part of the beach outside and that 

 inside of the moraine. Possibly the part outside required twice the time of 

 that inside, but tliis seems a rather high estimate. The estimates of relative 

 lengths should be supported by more data than have thus far been 

 collected. 



INNER BORDER PHENOMENA. 



The district covered by this description includes, on the east side of 

 the Cuyahoga, only a narrow strip lying between the Defiance and the 

 Cleveland moraine, and on the west side of that river a strip lying between 

 the Defiance moraine and the upper beach of the glacial Lake Maumee. 

 The width of this strip is variable, being 4 to 8 miles from the meridian 

 of Findlay eastward to the Sandusky River, 12 miles on the meridian 

 of Belle vue, a very narrow strip near the meridian of Norwalk, and 15 

 to 20 miles from the meridian of New London eastward to Berea, beyond 

 which it decreases to a breadth of about 10 miles at the Cuyahoga River 

 and 2 to 3 miles at Chagrin River, east of which it remains narrow. 



