o 



G6 



THE AZOIC SYSTEM AND ITS SUBDIVItlONS. 



greater antit|iuty. In the presence of diorites, felsites and other crystalline 

 rocks, lie finds this series to resemble the Huroniau strata of St. John County. 

 Portions of it do indeed correspond in the appearance of the l:.cds to the Ilnro- 

 nian of that county, but the aeries of the coast is much more voluminous than 

 the resembling parts of the Coldbrook group, and contains conglomerates, lime- 

 stones, micaceous slates, feldspathic grits, etc., which have not been recognized 

 among the Huronian rocks of St. John County, first described as the Coldbrook 

 group." (l. c, p. 83.) 



In this connection it may be well to remember that later Dr. Hunt 

 acknowledged that at that time his '' opportunities for studying the 

 Iluroulan had been very imperfect." 



Again Messrs. Bailey and Matthew say : — 



" These Devonian sediments appear to dip beneath those of the Coastal type 

 at those points where the two have been observed together, but, as the latter 

 are lithologically unlike those of the Devonian series, and do strongly resemble 

 those elsewhere referred to the Coastal group, we suppose that the appearance 

 alluded to is due to a dislocation." (/. c., p. 94.) 



Again, of the Coastal rocks in another locahty : 



" Their superposition on the Dadoxylon sandstone, however, being probably 

 the result of a faiilt and overlap, they are considered as pertaining to the same 

 horizon with the strata already described along the coast westward of St. 

 John, and in Charlotte County, to which the designation of the Coastal group 



has been given." (/. c, p. 98.) 



It is also stated that, although Upper Silurian strata were found 



"in- 



tercalated with the Kingston rocks, the intimate association of the two 

 is evidently accidental"; hence the Kingston rocks are Huronian, espe- 

 cially as the Coastal group overlies them. How the "accidental inter- 

 calation " could occur between Huronian and Upper Silurian rocks is 

 not explained. 



We thus see that, while the Portland group remains in the Lauren- 

 tian, the Bloomsbury group, formerly regarded as Upper Devonian, is 

 placed in the Lower Coldbrook group; the Coldbrook group divided 

 into two portions, and the upper one assigned to the St, John group ; 

 the Kingston group taken from the Upper Silurian and Lower Devo-. 

 nian, and placed above the Lower Coldbrook in ,the Huronian; and 

 the Coastal group formed from part of the Little Paver group of the 

 Upper Devonian and placed in the Huronian above the Kingston group. 



In this way two groups of rocks are intercalated between the two 

 members of the Coldbrook group. It is necessary to remember, while 



