MacMillan : SHORES AT LAKE OP THE WOODS. 955 



hornblendic and micaceous schists, clay shales, agglomerates, 

 chloritic schists and gneisses. The latter are perhaps the most 

 generally distributed. These rocks classified by Lawson as 

 Keewatin, Laurentia'n and later irruptive are in certain tracts 

 developed in astonishing variety and the region as a whole 

 gives an opportunity for the formation of most complicated 

 soils. There is, however, an absence of calcic, magnesic and 

 ferric soils with a rather poor development of aluminic soils 

 except in the regions of argillaceous shales or where argilla- 

 ceous drift has been deposited as is the case at a few points. 

 For the most part the soil, where it exists in quantity, is either 

 humus accumulated in pockets owing to the favorable surface 

 contour of the subtending rocks or a silicious and pebbly drift 

 with but slight admixture of clays. Opportunities for the 

 development of beaches and dunes are, therefore, not wanting, 

 while owing to the general prevalence of rock with but thin 

 drift covering or scant talus formations, bog shores or marshes 

 are rather exceptional. 



Types of shores. — There seem to be at Lake of the woods 

 three principal types of shores so far as the substratum is con- 

 cerned. These I shall denominate. 



I. Shores of country rock. 

 II. Shores of drift. 

 III. Shores of humus. 



Each of these, it is evident, may be subjected to subdivision, 

 and especially is this true of the first two. The following syn- 

 opsis will give at a glance the classification which has seemed 

 most desirable and convenient for the purposes of this paper. 



I. Shores of country rock. 



A. Country rock in place. 



1. Steep precipitous shores. 



a. Creviced rocks. 



b. Smooth rock*. 



2. Hounded shores. 



a. Creviced rocks. 



b. Smooth locks. 



3. Flat shores. 



a. Creviced rocks. 



b. Smooth rocks. 



B. Talus. 



1. Abrupt and precipitous talus. 



2. Talus extending out over the lake bottom. 



3. Talus with bare crevices (new talus;. 



4. Talus with intermixed humus or drift (old talus). 



