I50 



A. P. COLEMAN 



mens collected were mixed with Pleistocene bowlder clay they could 

 hardly be distinguished from the other stones in the clay unless per- 

 haps by lacking the polish found on some from the Pleistocene. 

 When it is remembered that the Lower Huronian tillite has under- 

 gone mountain-building stresses and a certain amount of metamor- 

 phism, it is astonishing to iind the striations so perfectly perserved, 



Fig. I.— Lower Huronian "soled" bowlder with striations in several directions. 



especially in the absence of limestone and slate pebbles, which afford 

 the best marked glaciated stones of the Pleistocene. In the Lower 

 Huronian tillite, felsites and fine-grained greenstones show the striae 

 best. The illustrations given are of greenstones. 



The types of rock observed are granite, gneiss, massive greenstone, 

 green schist, felsite, and banded chert or jasper of the iron formation; 

 all found in place in the underlying Keewatin and I^aurentian, the 

 only older formations existing in the localities. The granites are of 

 at least three kinds, and include most of the larger bowlders, one 



