240 /. M. BELL 



Eastward from Otter Head the inclusions of gneiss appear of finer 

 grain, though always very evenly banded. Gradually these inclu- 

 sions become more and more common and widen into definite bands, 

 alternating with areas of granite, and more closely resemble the 

 ordinary types of schist. Sometimes the bands of schist are joined 

 to each other by strips of granite. Finally, at about nine miles east 

 of Otter Head, at the prominent point just east of Richardson's 

 Harbour and about four miles west of the mouth of the Pucaswa 

 River, schists alone appear, and are the prevailing rock as far as 

 Ganley's Harbour. 



Now, the points which I wish to emphasize are these: 



1. A prominent part of the Lower Huronian schists is composed 

 of felsite and quartz-porphyry schists which have sometimes a gneis- 

 soid appearance. 



2. An Upper Huronian conglomerate contains many granite, 

 quartz-porphyry, and felsite pebbles which are unlike the Post- 

 Huronian acid eruptive rocks. The pebbles of quartz-porphyry and 

 of felsite were probably derived from flows of quartz-porphyry and 

 felsite, now represented by their metamorphic equivalents, the quartz- 

 porphyry and felsite schists. No rock earher than the conglomerate 

 at present outcrops from which the granite pebbles could have been 

 derived, unless it is the acid gneiss. 



3. Immense masses of granites and other acid eruptives cut the 

 Huronian, and are hence later than these rocks. These granites 

 form at least a very prominent part of the acid-eruptive complex, 

 known as Laurentian. Contained as inclusions, sometimes of con- 

 siderable size, within these acid eruptives, are earlier acid igneous 

 rocks which are typical gneisses. 



May not the areas of gneiss be of the same age as the Lower 

 Huronian, and represent merely an intensely metamorphosed felsite 

 or quartz-porphyry, or the deep-seated equivalent of these rocks ? 

 Again, is it not possible that the granite pebbles which occur in the 

 Dore conglomerate were derived from a rock no longer existing, but 

 of which the Post-Huronian granite is possibly the -regranitized 

 equivalent ? Of this Pre-Upper-Huronian rock it is possible that 

 the small patches of gneiss within the Post-Huronian granites are 

 the metamorphosed remnant. 



