1 88 H. C. COOKE 



a 



the mica gneiss is interbedded with garnetiferous mica gneiss, horn- 

 blende gneiss, or amphiboHte, garnetiferous hornblende gneiss, and 

 crystalline limestone. The garnetiferous mica gneiss is identical 

 in composition with the non-garnetiferous type, except for the 

 presence of the garnets. The hornblende gneiss, or amphiboHte, 

 is a black, gabbroid rock, which may be of igneous origin, although 

 no evidence of such origin could be obtained, and it is interbedded 

 with the other rocks with perfect conformity. The garnetiferous 

 hornblende gneiss is very similar to the non-garnetiferous type, with 

 the addition of garnets ; as in the case of the other, no evidence of 

 an igneous origin could be obtained for it, and it is suspected that 

 it may be a recrystallized, impure, calcareous sediment. In sup- 

 port of this view is the fact that the only crystalline hmestone 

 found, consisting of two beds, each about a foot in thickness, is inter- 

 bedded with the garnetiferous hornblende gneisses. 



This series of sediments has been named by the writer the 

 Nemenjish series, from the lake on which it is best exposed. 



The succession in these areas is therefore as follows: 



Windy Lake Area Kaopatina-Nemenjish Area 



Tuff aceous sediments Nemenjish series : Interbedded gar- 



netiferous and non-garnetiferous 

 mica gneisses and hornblende 

 gneisses, with crystalline lime- 

 stones 

 Rhyolite porphyry Garnetiferous mica gneisses 



Flows of intermediate composition Interbedded mica gneisses and basic 

 Andesites tuffaceous sediments 



Basalts Basalts 



Eau J aune-Ohatogamau area. — ^This area includes Eau Jaune 

 Lake and part of Obatogamau Lake (Fig. 7), together with a part 

 of Presqu'ile Lake; but outcrops below Eau Jaune Lake are so 

 scarce that the structure of this latter portion of the area could not 

 be determined. The area is of interest mainly because of its con- 

 spicuous cross-folding. In the other areas described the axes of 

 folding have a general east-west strike, and the cross-folding has 

 been sufficient only to give these axes plunges varying from 15° 

 to 30°. In the Eau Jaune area and, it may also be remarked, in 

 the sediments on Nemenjish Lake, the cross-folding is as intense 



