272 GLACIAL GRAVELS OF MAmE. 



ice diTi-ing the beginning and near the end of the existence of the ice-sheet, 

 yet this supposetl moraine stuff is not now so distinctly arranged in the 

 form of medial or lateral moraines as to warrant the assertion that any 

 considerable amount ever fell upon the ice from above. And it is therefore 

 practically self-evident that during the time when all the country was cov- 

 ered with ice the morainal matter could get into the ice only from beneath. 



MORAINAL DEBRIS OF THE ICE-SHEET. 

 MORAINE STUFF IN THE LOWER PART OF THE ICE. 



That till matter had in some way worked up into the lower part of the 

 ice is conclusively proved by the presence of several terminal moraines. 



WALDOBORO MORAINE. 



The largest of these terminal moraines extends from near Winslows 

 Mills, Waldoboro, for about 6 miles north and eastward. Its general 

 appearance is that of a two-sided ridge, or sometimes of two or three 

 roughly parallel ridges. It is composed of the same kind of matter as the 

 upper layers of the till of the surrounding region, unless perhaps it has had 

 a small proportion of the finest rock flour washed out of it by very gentle 

 cvirrents. 



Regarding this moraine it may be said: 



1. The moraine is not composed of matter torn lip from the ground 

 moraine or previously deposited till and pushed forward by the snout of 

 an advancing glacier. As elsewhere recorded, a series of hummocks and 

 short ridges of glacial gravel extends from Waldoboro northward along the 

 Medomac Valley to a point more than a mile north of the moraine. One 

 mound of this series directly underlies the more northern of the two ridges 

 at Winslows Mills. If the ice during an advance had been .able to push 

 before it so large a ridge composed of till previously laid down on the bare 

 earth, it ought to be able to push before it the heap of glacial gravel now 

 found beneath the moraine, as well as all the other eskers situated north of 

 this point. But no esker material appears in the moraine — only ordinary, 

 slightly water-washed till. Also, the external forms of the eskers north of 

 the moraine differ little if any from those situated south of it, so far as I 

 could discover. 



