134 ROYAL SOCIETY OF CANADA 



summit of the eminence, though not far from its base and at various 

 levels on the slopes of closely adjacent hills are numerous exposures of 

 coarse bright red sandstones and conglomerates. Thus it would seean 

 to represent a pipe or chimnc}' penetrating the Lower Carboniferous 

 formation, the beds of which are partly altered by its extrusion. On 

 the other hand, near the summit of these same bordering hills, the red 

 sediments in question, lying horizontally, are covered, also horizontally, 

 by extensive sheets of what may best be described as a trap-ash, while 

 over both are the coarse gray grits and conglomerates of the Coal 

 measures. 



The ash-rocks are generally and sometimes coarsely vesicular or 

 amygdaloidal, the most common filling of the cavities being calcite 

 and quartz, sometimes in large crystals, accompanied not unfrequently 

 by chlorite or its variety delessite. Vertical cylindrical or serpentine 

 tubes filled with white calcite and, bordered by delessite, are sometimes 

 met with. Epidote, if occurring at all, is rare. Zeolites also, with 

 the exception of a little red heulandite, are mostly wanting. Pseudo- 

 morphs and incrustations of quartz on calcite are frequently met with. 

 From the entire absence of any material similar to the above in 

 the basal beds of the Millstone Grit which rest directly upon the sheets 

 of amygdaloid and ash rocks, it is evident that the spread of the latter 

 antedated the period last named, and was a closing episode of the Ldwer 

 Carboniferous era, a fact which would appear to be of general applica- 

 tion. 



On the Eoyal Road, several miles back from Curriers Mountain, a 

 similar relation of beds to those of this eminence may be seen, but the 

 want of exposures between makes it impossible to connect them as parts 

 of a single outburst. 



Another locality, closely paralleling that of Carrie's Mountain, 

 except that no central pipe is observable, is to be seen on the S. W. 

 Miramichi river, about five miles above Boiestown. Soft bright red 

 sandstones of the Loiwer Carboniferous formation, in nearly flat beds, 

 are directly covered by about forty feet of gray vesicular ash rocks, with 

 blocks of white felspar, distinctly bedded, and overlaid by gray grits 

 and conglomerates filled with white quartz pebbles. 



Similarly, upon the south side of the great central basin, relations 

 in every way parallel to the above occur in Clone's settlement in 

 Queen's county. 



Finally, near the centre of the basin, on the Newcastle river, in 

 Queens county, and not far from the coal workings at Grand Lake, the 

 gray Carboniferous roeks, filled as usual with white quartz pebbles, 

 may be seen (at-lSTewcastle Forks) to rest upon sheets of gray amygda- 



