GEOGRAPHY AND NATURAL HISTORY OF THE TOBIQUR. 23 



on the slopes of the surrounding hills the same beds appear 

 through the soil. 



The Lower Carboniferous in this district is not found at 

 any considerable elevation except at Plaster Rock and perhaps 

 Blue Mountain, and the hills over this formation are generally 

 kames or gravel ridges except Blue Mountain, which is of 

 volcanic origin, and Plaster-Rock ridge. 



Passing on up river we come at Black Rock to further 

 outcrops. The rock is here not so coarse in structure, 

 consisting of red and grey grits with thin beds of red and 

 bright green shales. 



The grits would make a good building stone and are 

 traversed by joins which produce natural blocks, though these 

 are often too small; part of the beds split into wide sheets 

 which might be used for sills or flagstones. 



The sandstones now get softer and more calcareous. A 

 railway cutting a mile and a half below Wapskehegan shows 

 them well. They are here beautifully coloured in shades of 

 grey, purple and red. The shales also increase in thickness, 

 one green band being over a foot thick. They quickly 

 crumble on exposure to the atmosphere. 



Just below Wapskehegan we come to still higher beds 

 of the same series; here limestone ledges stretch out into the 

 river and are covered by the water during freshets. Above 

 the limestones are fine sedimentary beds with red and white 

 layers, which rise perpendicularly out of the water to a height 

 of fifteen feet. From the regular facing of the cliff on the 

 river and the somewhat level top, it goes by the name " Tom 

 Day's Wharf," called after a well known character in the 

 neighborhood. 



Above this on the bank are limestones partly compact 

 and crystalline and partly having a conglomerate or nodular 

 structure, and with them layers or masses of olive green shales. 

 The limestones show no trace of animal remains, and 

 would seem to be a chemical deposit and not formed as those 

 of Windsor, N. S., and other localities, principally from the 

 relics of sea life. 



