100 



Locality I, is composed of rocks genetically related to 

 gabbro. 



Locality j. — At the Bear's Head, near the entrance 

 to the bay at the extreme south of Parry island, three 

 rock types are observed. On the west shore of the bay, 

 anorthosite forms high ridges bordered on the east by 

 crystalline limestone. The strike of these rocks is north- 

 northeast, with a dip to the eastward. The anorthosite 

 exhibits slight parallelism near the contact with the lime- 

 stone, but a few rods to the west it becomes quite massive. 

 The east shore of the bay is made up of gneisses, more or 

 less hornblendic, and following the same dip and strike as 

 the anorthosite, and limestone. 



Locality 4. — Pierce island, 3 miles (4-8 km.) south 

 of the Bear's Head, exhibits crystalline schists of a different 

 type. The rock is composed of alternate layers of light 

 and dark bands, wonderful for the sharpness of the bound- 

 ary lines between the bands and for the persistence of the 

 individual members. This complex strikes north and south 

 and has a vertical dip. The dark bands are largely of 

 hornblende with smaller proportions of plagioclase, while 

 the light bands represent a fine grained granite. The rock 

 in the individual bands is always massive. The material 

 of this banded complex appears to be igneous, but it is 

 difficult to conceive of conditions accounting for the 

 peculiar relationship exhibited. 



Locality 5. — The rocks along the east shore of the 

 channel between Pierce island and Parry Sound closely 

 resemble those exhibited at Locality 4, except that the 

 strike swings to the northeast, while the dip to the south- 

 east is quite marked. The channel appears to indicate a 

 line of great pressure, as may be seen at Locality 5 on the 

 east side of Isabella island, where a very granular grey 

 gneiss may be observed showing large augen of orthoclase 

 and hornblende. 



PALEOZOIC SECTION AT COLLINGWOOD. 



The town of Collingwood has a population of about 

 8,000: it is situated on an excellent harbour, and has long 

 been known as a port and shipbuilding centre. 



The Blue mountains are visible from Collingwood and 

 rise to a height of more that 1,000 feet (304 m.) above the 



