NEW BRUNSWICK. 



3G5 



upon black carbonaceous crumbling sliales These latter dark colored 



rocks resemble very closely some portions of the St. John grouj) as seen in the 

 city of St. John, and are supposed to be continuous with them through a belt 

 of similar rocks, extending across the peninsula of Pisaiinco, and coming out at 

 MiU Creek in Pisarinco Harbor. In this view, it is probable that the structure 

 indicated in this group at St. John, and to be presently noticed, will hold good 

 here also, viz. : That the St. Juhn group is inverted upon itself, and that the 

 green crystalline schists, though overlying that group, are in reality more an- 

 cient and probably of Huronian age." {I. c, p. 60.) 



Of the Huronian rocks at RatcliflFe's mill-stream it is stated tliat 



" they overlie the Primordial strata, both formations occupying a nearly verti- 

 cal position, with a slight southward inclination, and both being inverted." 

 (l. c, p. 63.) 



Of the Bloomsbury group it is again remarked : — 



" In our earlier publication, this hill .... has been referred, from the fact 

 of its overlying the slates of the St. John group, to the Devonian series ; but 

 the close resemblance in aspect borne by the rocks composing it to those so 

 largely developed to the north and north east, from which they are separated 

 only by a narrow valley, renders it more probable that the great mass of strata 

 in this hill is of Huronian age, and that, though here apparently resting upon 

 the Primordial strata (which in the valley alluded to dip southerly under 

 Bloomsbury Mountain) they are in reality more ancient than these latter, and 

 are here brought up along a line of faidt in a similar manner to those of 

 Ratcliffe's millstream." {I. c, pp. 63, 64.) 



The upper part of the Coldbrook group, from its conformably under- 

 lying at other places the St. John group, and from its containing peb- 

 bles supposed to have been derived fi-om the lower portion of tlie 

 Coldbrook group, was regarded as forming the base of the Primordial 

 or St. John group, (/. c, p. 59,) an unfossiliferous portion of the latter. 

 As we have seen befoi-e, part of the Coldbrook group was found resting 

 on the St. John gi-oup ; the latter was supposed to have been inverted 

 upon itself, which would explain the fact that Huronian rocks were 

 overlying Primordial ones. (/. c, pp. 13G-139.) 



Of the rocks of the Coastal group it is said that they 



" have been foimd to overlie, at several points, strata of Upper Silurian and 

 Lower Devonian age. Hence, those occurring along the coast were, in our re- 

 port on the geology of Southern New Brunswick, described in connection \vith 

 the Devonian rocks of St. John County, under the denomination of the Coastal 

 group, Dr. Hunt, however, who has examined a large number of specimens 

 collected from these rocks, and has Wsited a part of the districts in which they 

 occur, is of opinion that their Hthological aspect is such as to indicate much 



