On the Norian or " Upper Laurentian " Formation. 175 



escent labradorite. A very large area of anorthosite was 

 found by Hind l on the river Moisie and on its branch, 

 the Clearwater. This area must be very large, although its 

 eastern and western limits are not yet well determined. 

 The Clearwater flows through a valley estimated by Hind to 

 be 2000 ft, deep which is cut in these rocks. 2 They likewise 

 occur in a number of places on the north shore of the St. 

 Lawrence between the Moisie River and the mouth of the 

 Pentecost River. 3 



Next in order comes what is probably most extensive of 

 all the areas, that north of Lake St. John and the upper 

 waters of the Saguenay, which river has its source in this 

 lake, and runs into the St. Lawrence about 125 miles below 

 Quebec. This mass has an irregular oblong shape and its 

 larger diameter runs parallel to the shore of the St. Law- 

 rence, at a distance of about 80 miles. Other areas are 

 found in the neighborhood of Bay St. Paui on the St. Law- 

 rence River, 4 at Chateau Richer 5 below Quebec, and in the 

 district between the latter place and Lake St. John. 1 ' In 

 the Laurentian region which lies to to the north of the St. 

 Lawrence between Three Rivers and Montreal there are no 

 less than 11 areas, most of which are of very limited extent, 

 but one of these which we may call the Morin area and 

 which lies about 25 miles north of the island of Montreal 

 has an area of 990 square miles. Still another occurrence 

 was discovered and described long ago by Bigsby, ' on the 

 north shore of Lake Huron, and many other smaller unim- 

 portant areas are recorded elsewhere in the Laurentian of 

 Canada, but deserve no further mention. There is also an 



1 Hind, Exploration in the interior of the Labrador Peninsula, London, 1863, 

 also Ed. Cayley : " Up the Moisie." Trans. Lit. and Hist. Soc- of Quebec. New 

 Series Vol. V. 1862. 



2 Hind, Observations on the supposed Glacial Drift in the Labrador Peninsula, 

 etc., Quart. Jour, of the Geol Soc, Jan. 1864, and Canadian Naturalist, 1854, p. 

 302. 



3 Richardson, Rep. Geol. Survey of Canada, 1866-1869. 



4 Geology of Canada 1863, p. 46. 



5 " " " p. 46. 



6 Low, Summary Rep. Geol. Survey of Canada 1890, p. 35. 



7 Bigsby, A list of minerals and organic remains occurring in Canada. Am. 

 Journ. of Science, 1 Ser., 1824, p. 66. 



