NEW BRUNSWICK. 361 



annelides, and coprolites ; 4th, Bloomslniry Group ; 5th, Little River Group, 

 containing numerous plants, several crustaceans, and wings of insects, etc. ; 

 6th, Mispeck Group." {L c, pp. 244, 245.) 



He states that no proof has been observed that the St. John group is 

 unconformable with either the overlying or underlying rocks. (/. c, 

 p. 247.) The Mispeck group is said to contain fragments like the lower 

 slates of the Coldbrook group. (/. c, p. 253.) The rocks in the vicin- 

 ity of Black River, to which the name Coastal group was afterwards 

 given, were here classed under the Little River group. This gi-oup 

 was divided into two parts, the lower called the Dadoxylon sandstone, 

 and the upper the Cordaite shales. He says it seems clear that the 

 Black River rocks mentioned above 



"form a part of the Upper Devonian series, because, — 1st They overlie the 

 Dadoxylon sandstone conformably (or nearly so). 2ud They underlie car- 

 boniferous deposits unconformaldy. 3rd They partake of the flexures of the 

 Devonian series, which preceeded the formation of the Lower Carboniferous 



conglomerate I have connected them with the cordaite shales, but it is 



quite possible that the upper part may be altered beds of the Mispeck group." 

 (I. c, pp. 252, 253, 256-258.) 



Mr. Matthew's statements regarding the age of the entire series are 

 far from being clear. In some places he appears to regard them as 

 Devonian, in others as being in part Devonian and in part Silurian. 

 His language admits of no other interpretation than that he regarded 

 the Coldbrook group as being of Devonian age. (l. c, pp. 258, 259.) 



In 1865 the same geologist referred the Portland series to the Lau- 

 rentian and the Coldbrook group to the Huronian. The Coldbrook 

 rocks were placed in two divisions, a lower and an upper. The upper 

 division is said to be " largely composed of erupted materials, diorites, 

 tufas, and volcanic mud," the same as the Huronian of Canada, and to 

 be " conformably surmounted by the lowermost strata of the Lower 

 Silurian formation." 



He further remarks : — 



" Considering, therefore, the origin of these deposits as well as their position 

 relative to the more ancient series and the Lower Silurian beds above, we have 

 little hesitation, notwithstanding that the latter are conformable to them, in 

 assigning these semivolcanic sediments to the ' Huronian series ' of Logan." 



The St. John group was regarded by him as being the equivalent of 

 the Potsdam, Calciferous, and possibly Chazy formations. 



A series of rocks which cover an area of about seventy miles long and 



