PORT HURON MORAINIC SYSTEM AND PROBABLE CORRELATIVES. 



311 



light Lake and Grand Traverse Bay. The height of few of the drumlins exceeds 60 feet and 

 that of the majority is 30 feet or less. The smallest are only 10 to 15 feet high. 



The dru mlin s trend south or but slightly east of south on the borders of Grand Traverse 

 Bay, but change gradually to southeastward in the district around Pine Lake (fig. 2), corre- 

 sponding very rudely to the great valleys and ridges of the region. The greatest discordance 

 is with the south arm of Pine Lake and the west arm of Intermediate Lake, which trend south, 

 whereas the adjacent drumlins trend considerably east of south. 





Figure 2. — Map of part of dnimlin i 



Algonquin beactr 

 i south and east of Charlevoix, Mich. 



Origin. — The drurrdins are composed of a very evenly mixed stony till, stones being dis- 

 tributed through almost every cubic inch of the deposit. The majority of the stones are small, 

 but some bowlders were noted and small rock slabs are not rare. In most of the exposures the 

 till shows indistinct partings rudely concentric with the surface. The rock slabs do not show, 

 as in ordinary till, all sorts of deposition from vertical to horizontal, such as result from 

 dropping into a deposit, but he in the plane of the deposits, as if carried by the ice across the 



