SOUTH WESTERN NOVA SCOTIA. POWERS. 305 



dynamic and contact metamorphism. The former, as shown 

 in Lunenburg and Halifax counties, produced thick-bedded 

 compact quartzite, usually showing minute flakes of mica, 

 and siliceous slates, usually of a grey-green color and very 

 fine grain with no metacrysts. The metamorphism of these 

 beds was not quite completed when the granitic intrusions 

 of Middle Devonian age took place, for the igneous rock is 

 everywhere more or less sheared. The contact metamor- 

 phism near the granite has produced recrystallized schist and 

 quartzite, and farther away has caused the formation of 

 metacrystals of staurolite, andalusite, biotite, hornblende, 

 garnet and sillimanite. 



In the southern portion of Shelburne County, the contact 

 metamorphism has been so extensive as to be almost regional. 

 On Negro Island, which is 10 miles fron the nearest granite 

 outcrop, the staurolites still persist in the schist although the 

 quartzite is free from metacrysts. The characteristic fea- 

 tures of the metamorphism are the development of either 

 staurolite or mica or both in the schist everywhere, the re- 

 crystallization of the quartzite near the granite with the de- 

 velopment of the muscovite in large quantities and some 

 biotite, and the lack of alteration of the quartzite elsewhere, 

 except near Sand Point where within three miles of the gran- 

 ite some metacrysts appear. 



The date of the block faulting, which is shown on the map, 

 is probably late Carboniferous. This diastrophic period did 

 not develop intense folding in the Maritime Provinces, but 

 it was accompanied by faulting. In Kings County the fault- 

 ing is later than the intrusion of igneous rocks of Devonian 

 age. The details concerning these faults have been sufficiently 

 discussed above. Faults are characteristic of the Goldbear- 

 ing series throughout its extent, but this block faulting is 

 uncommon in the districts near the gold mines. 



