E. Andrews—Glacial Markings of unusual forms. 99 
* r 
Art. XII.—Glacial Markings of Unusual Forms in the Lauren- 
tian Hills ;* by KE>MuND ANDREWS, M.D., LL.D. 
T'wo summer vacations spent in camps and canoes where the 
Laurentian Hills skirt the northeast shore of Lake Huron have 
brought to my notice some glacial phenomena of very unusual 
_ sorms, 
are mostly white quartzite and gneiss, and are everywhere cov- 
ered with glacial markings, which are often of peculiar forms. 
North and northeast of Grand Manitoulin Island, the Cloche 
Mountains stretch east and west about thirty miles along the 
coast. ‘These mountains are of white quartzite and the strata 
are nearly perpendicular, with their striz parallel to the range, 
that is, east and west. They are covered everywhere with 
Striations, which, owing to the intense hardness of the material, 
retain their forms with beautiful distinctness. 
CURVED STRL&. 
* Read before the Chicago Academy of Sciences, 
