DEVONIAN OF NEW BRUNSWICK. 511 



the Black and Mispeck Rivers, and towards the foot of Loch Lomond. 

 On the southern shore of the latter red sediments also occur, which 

 have been doubtfully referred to the Coldbrook Group, but may 

 possibly be a continuation of the beds last described. On the south- 

 eastern side of the Bloomsbury axis, the upper member of the group 

 again appears, but it is here a comparatively thin deposit, and 

 occupies but a very limited area. 



" Turning to the westward, this member is also but poorly re- 

 presented, and at Courtnay Bay does not exceed a thickness of 

 loO feet. In St John and Carleton, as well as at Sheldon's Point, 

 it is wanting altogether. On the west bank of the Musquash, 

 however, in the village of Ivanhoe, reddish sediments occur resting 

 upon the Portland series and overlaid by the Dadoxylon sandstone, 

 and therefore belonging to the Upper Bloomsbury, but whether they 

 have any direct connexion with the deposjts to the east, or are 

 the result of local and independent deposition, it is at present 

 impossible to say. 



" In lithological characters the upper member of the Bloomsbury 

 group is very constant, consisting of fine-grained red clay slate 

 and reddish-gray conglomerate. Its thickness has been stated at 

 500 feet. The rocks of this member, according to Mr Matthew, 

 constitute a passage from the volcanic beds to the sandstone of the 

 (Little River) group above. As far as known they contain no 

 fossils." 



" (B.) Volcanic Beds. — The most extensive and typical exposure 

 of the volcanic beds of the present group is fui-nished by the locality 

 from which their name has been derived, the high hill called Blooms- 

 bury Mountain, near the centre of the parish of Simonds. This 

 mountain, as described by Mr Matthew, constitutes the western 

 termination of a ridge of land extending north-easterly in the centre 

 of the county, and appears to represent one of the ancient fissures 

 or volcanic vents, from which, during the Devonian period, were 

 poured forth the lava, ashes, and scoria, which now constitute the 

 lower member of the Bloomsbury group. The streams of eruptive 

 matter thus discharged flowed from the central opening in three 

 directions, north-easterly, westerly, and south-westerly, as indicated by 

 the positions whicli they now occupy. 



"The upper limit of the Bloomsbury lava streams, trending to 

 the west, may be traced in a long, though narrow, line of hills, from 

 the head of Black River, below Loch Lomond, to Courtnay Bay. 

 Removed by denudation from the latter, the beds of the group re- 

 appear in the southern part of the city of St John, and again on the oppo- 



