REVIEWS 905 



Ottawa, are found associated with the gneiss as far north as the 

 northern limit of the map-sheet. 



The definition of the so-called fundamental gneiss is, as a 

 matter of fact, not always possible in this district. If the 

 latter appears at all, it must be along the crests of some of the 

 numerous north-south anticlines, which are generally low, the 

 rocks over a large area being inclined at low angles. The pre- 

 vailing gneiss is a grayish and hornblendic variety, generally 

 quartzose, and with frequent bands in which garnets are 

 abundant. 



The anorthosites are intrusive in the Grenville series. The 

 Grenville series are correlated with the Hastings series and both 

 are equivalent to the Huronian. The Fundamental gneiss is 

 Laurentian. 



Bell 1 describes and maps the geology of the Baffin Land 

 shore of Hudson Strait. 



The rocks of the northern side of Hudson Strait from North 

 Bay to Chorkback Inlet and inland to Lake Mingo consist of 

 well stratified hornblende and mica-gneiss, mostly gray in color, 

 but sometimes reddish, interstratified with great bands of crys- 

 talline limestones, parallel to one another and conformable to 

 the strike of the gneiss, which in a general way may be said to 

 be parallel to the coast in the above distance. The direction, 

 however, varies somewhat in different sections of the coast. All 

 are of Laurentian age. 



The distinguishing feature in the geology of the southern 

 part of Baffin Land is the great abundance, thickness and regu- 

 larity of the limestones associated with the gneisses. At least 

 ten immense bands, as shown on the accompanying map, were 

 recognized, and it is probable that two others, discovered in 

 North Bay, are distinct from any of these. There would, there- 

 fore, appear to be twelve principal bands as far as known, to say 

 nothing of numerous minor ones, between Icy Cape and Chork- 

 back Inlet. Their total thicknesses may be 30,000 feet, or an 

 average of 2,500 feet for each of the principal bands. These 

 rocks are correlated with the Grenville. 



I Geol. Surv. of Canada, Annual Report, New Series, Vol. XI, Part M, for 1898, 

 pp. 5M-38M; with geological map. 



