63 



bosses agree with the attitude of the contact plane between 

 the granite and the Coutchiching schists, this contact 

 being exposed in the face of cliffs that have various salients 

 and re-entrants. The anticlinal form of the mica gneisses 

 and schists is due to the intrusion of the Algoman batholith 

 which has simply arched them over itself to form a roof. 

 Dr. Lawson's conclusion is stated thus: "The Coutchich- 

 ing rocks are disposed in an anticline domed around an 

 intrusive mass of granite, and they pass on both flanks of 

 the anticline beneath the Keewatin". 



PARTICULAR DESCRIPTION OF POINTS TO BE VISITED. 



After leaving the train at Bear's Pass the route around 

 the shores of the lake follows in numerical order the small 

 numbers, I to 32 on the map. 



From the station to 1, a partial cross-section of the 

 Keewatin, is exposed. The strike and dip of the schist 

 and the nature of the coarse-grained gabbro can be observed 

 Going southward along the shore between 1 and 2, the 

 transition from Keewatin hornblendic and chloritic rocks 

 to Coutchiching micaceous schists, with about the same 

 strike and dip, may be seen, the latter dipping beneath 

 the former. From 2 to 4 the irruptive contact of the 

 Algoman biotite granite and the Coutchiching is well 

 exposed; the long narrow point at 3 affords a splendid 

 view of the contact breccia. The granite is pale pink 

 to white in colour, and somewhat fine-grained. The 

 shore line in this vicinity shows alternate outcrops of 

 Algoman and Coutchiching. 



A landing is made at 4 to examine the contact between 

 the Coutchiching and the Keewatin. Here the micaceous 

 schists are markedly quartzitic and are beautifully plicated. 

 The contact with the rather massive Keewatin greenstone 

 is sharp, and the Coutchiching dips rather steeply under it. 



From this point in a westerly direction to 8 an excellent 

 section is obtained across the Coutchiching formation 

 almost at right angles to the anticlinal axis. The shore 

 is followed closely, so that the attitude of the Coutchiching 

 beds may be noted. The steep southeasterly dips of the 

 formation to the east gradually flatten, until in the neigh- 

 bourhood of 5 and 6 they are nearly horizontal or locally 

 buckled. Here the locus of the anticlinal axis is reached. 



