VOLCANIC ROCKS OF THE MARITIME PROVIXCKS. 81 



St. John River, they form a conical hill over 1,000 feet 

 in height, from which a magnificent view of the surround- 

 ing country can be obtained. The great development of 

 igneous rocks of this period is, however, at Bale Chaleur. 

 In connection with the .Devonian of southern New Bruns- 

 wick are volcanic rocks ; sections of some near Point 

 Lepreau show them to be ordinary quartz porphyries of 

 no special interest. 



Again, in the sub-Carboniferous period we find that a 

 large amount of volcanic outpourings took place at various 

 points along the southern margin of the central plain, and 

 volcanic rocks appear from under the eroded millstone grit 

 rocks at Grand Lake, witliin this plain. The Blue Mount- 

 ains, north of the Tobique River, consist of effusive rock 

 referred to this period. These sub-C'arboniferous volcauics 

 are felsites and traps, and have not been studied with the 

 microscope. 



Throughout the Middle and Upper Carboniferous 

 and the Permian periods there is no trace of any volcanic 

 activity, but the small areas of Triassic rocks occurring 

 in New Brunswick, are associated with heavy trap dykes, 

 and about half of the island of Grand Manan is composed 

 of Triassic trap. 



The periods of volcanic activity in Xew Brunswick 

 are, then : 



1. Hiiroiiian — Southern New Brunswick and the 

 northern watershed. 



2. Silurian and Early Devonian — Passamaquoddy 

 Bay, Bale Chaleur, etc. 



3. Sub-Carboniferous — borders of the central plain^ 

 Grand Lake, Blue Mountains of the Tobique. 



4. Triassic — Quaco, Grand Manan. 



In Nova Scotia tlie volcanic rocks are not k'ss impor- 

 tant than in New Brunswick. In Cape Breton is a great 



