No. 1.] BAILEY — GRAND MANAN. 53 



considerable admixture of quartz. The associated rocks are 

 pale grey light weathering feldspathic grits, somewhat granitoid 

 in aspect, grey feldspathic quartzites, and greenish and purplish 

 altered schists, all much broken and disturbed. The other islands 

 in this group I have not examined. 



With reference to the age of the metamorphic rocks described 

 above, I can only add to the various conjectures already 

 made by other authors. In doing so, however, I may say that I 

 have had the advantage of being able to compare them directly 

 with the formations of the mainland, and thus of arrivins; at a 

 more probable estimate of their true position than is likely to be 

 obtained from the mere study of the rocks themselves. Of the 

 recognized formations in New Brunswick, they bear no resem- 

 blance to either the Laurentian, Primordial, Upper Silurian, or 

 Carboniferous. They are equally unlike the Devonian rocks, 

 so far as these have been clearly determined on palseontological 

 evidence. They do, however, bear much resemblance to an as- 

 semblage of strata met with at various points along the southern 

 coast of the Province as well as in the interior, and to a portion 

 of which a Devonian age has been assigned in earlier publications. 

 The rocks in question, embracing like those of Grand Manan a 

 series of coarse red sediments, grey clay slates, chloritic slates 

 and grits, with some limestones and dolomites, were at some points 

 found to rest upon undoubted Devonian beds, and were for this 

 reason referred to that horizon. It is not yet certain that such 

 is not their age, but a careful study of the district having shewn 

 the existence therein of several great faults and overlaps, it is 

 possible that the beds in question, notwithstanding the super- 

 position referred to, are really much more ancient. If this is the 

 case, there can be no doubt that they are to be looked ujDon as a 

 subordinate division of the great Huronian series, to the other 

 members of which, as recognized in southern New Brunswick, 

 they bear much resemblance. The metamorphic rocks of Grand 

 Manan have been compared by Dr. Dawson (from Prof Yerrill's 

 description) with what has been termed the Kingston series on 

 the mainland of the Province. They differ from these latter in 

 some respects, but as these Kingston rocks are now also believed 

 to be a subdivision of the Huronian system, (and not Upper 

 Silurian, as at one time supposed) this comparison may be taken 

 as an additional argument in support of the view here advocated. 



Prof. Verrill has suggested that possibly more than one group 



