388 THE CANADIAN NATURALIST. [June 



viously been given to the Cambrian rocks in the Quaco Hills, 

 led to the discovery of an important part of this series not 

 previously recognized as sedimentary; it consists of shales, grits, 

 and conglomerates, usually highly aietamorphic, so much so, as 

 in general to have lost all traces of stratification. In this 

 condition they appear to be syenites, granulites and felsites, all 

 highly coloured by the bright red felspar of which they are chiefly 

 composed. Masses of these rocks were observed by our party, 

 in 1864, on the Hammond River, and in the adjacent hills, but 

 their sedimentary character was not at that time recognized. 



With this addition the grand lithological features of the older 

 supra-Laurentian rocks in the Southern Hills of New Brunswick 

 appear to be : — 



Lower Silurian. — The lingula bearing flags and shales of 

 St. John, etc., at the base of which the primordial fauna occurs. 



Huronian. — Red sediments of comparatively small volume, 

 perhaps not recognizable in other parts of Acadia. ( No. 5 in 

 article on Azoic Rocks.) 



Dark coloured trap-slate rocks (Nos. 2 and 4, art. cit.) of great 

 thickness ; parted about midway by a rusty-colored calcareo- 

 arenaceous zone charged with iron and manganese. (No. 3, 

 art. cit.). 



Red sediment, usually converted into red felspar rocks, also 

 of great thickness, resting upon the Laurentian series ( No. 1 

 of article on Azoic Rocks is here included). The felsites referred 

 to (No. 3, in my article,) may be of this lower horizon, but I have 

 not been able to verify this point. The succession throughout 

 this immense series of beds is greatly obscured by faults. An 

 instance is given at page 28, of Mr. Bailey's Report. 



It is noteworthy that the core of the Northern Highlands of 

 New Brunswick consists, in a great degree, of red felspathic rocks 

 (vide Bailey's Notes on Geology and Botany of N. B., Can. JVat.), 

 and that these are flanked by metalliferous slates, frequently of a 

 dark brown colour, which may be of the same age as the 

 main portion of the Huronian in the south (Nos. 2 — 4) above 

 noticed. 



The resemblance of the Lower Silurian of Saint John to the 

 gold and antimony bearing slates of the central part of the 

 Province has been already noticed in the article cited above 

 Thus the Northern metamorphic region may present a full 



