512 THE DEVONIAN PERIOD. 



site side of the harbour in the town of Carleton. They are some- 

 what increased in bulk in the latter place, but soon disappear to 

 the westward under extensive accumulations of post-pliocene gravels. 

 At Sheldon's Point, however, and Manawagonish, rocks probably 

 referable to the present group occur, and beyond in the peninsula 

 of Pisarinco, as well as on the Musquash River, and westward 

 towards Lepreau. 



" The second great belt of Bloom sbury lavas, trending south- 

 westerly, though in much thicker beds than those last described, 

 is comparatively limited in distribution, reaching only from the 

 central vent of Bloomsbury Mountain to the Millicent Lake, in 

 the rear of Mispeck. The valley of Black River cuts directly 

 across, and is largely included in the series referred to, and in its 

 upper part forms the line of division between its two members. 

 The thickness of the lower member, as measured by Mr Matthew, 

 has been approximately stated at 2000 feet. 



" Of the eastward flow of the Bloomsbury lavas, little is known. 

 Notwithstanding the great thickness of the group near the sources 

 of Black River, it can be traced but a short distance in this direction, 

 being rapidly covered and concealed by the Carboniferous deposits 

 in the rear of Quaco. 



" At Bloomsbury Mountain, where the best exposure has been 

 stated to occur, the following peculiarities have been noticed by 

 Mr Matthew : — 



" ' The elevation consists of basaltic trap, and is flanked on each 

 side by beds of amygdaloid, trap-ash, and other products of volcanic 

 origin, which also cover the crest of the anticlinal fold for two or 

 three miles west of the hill. The succession of strata is best dis- 

 played on the south side of the hill, where they succeed each other 

 in the following order : — Basaltic trap, unstratified, of great thickness ; 

 bedded basalt, amygdaloidal porphyry, bedded basalt, hornblendic 

 trap-ash, micaceous quartzite, vesicular trap-ash slate ; thickness of 

 the stratified deposits about 3000 feet. There is also on this slope 

 a volcanic conglomerate, viz., fragments of trap rocks imbedded in 

 trap-ash slate. The quartzite resembles some of the finer beds at 

 West Beach and Black River, and the porphyry is that alluded to 

 in Gesner's Third Report, p. 15. The trap-ash slate is in many places 

 full of irregular vesicles, the sides of which are coated with minute 

 crystals of quartz, calcite, and specular iron.' 



" The remaining portions of the lower Bloomsbury beds do not 

 differ from those above described, except in the comparative in- 

 frequency of unstratified basalt." 



