352 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [March 13, 



Cobequid Bay. 









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point to which we have already traced its southern boundary), it forms 

 a broad and irregular tract of metamorphic country. Westward of 

 this tract it is again subdivided ; one branch extending near the 

 margin of the granitic group, on the south side of the Stewiacke Riyer, 

 as far as the Shubenacadie River ; another 

 extending for a short distance between the 

 Stewiacke and Salmon rivers ; and a third, 

 or rather a group of detached masses, ex- 

 tending through Mount Thom to the eastern 

 extremity of the Cobequid range of hills. 

 In the hilly country connected with Moimt 

 Thom, and in the vicinity of the upper 

 parts of the Salmon, West, and Middle 

 rivers, considerable breadths of lower carbo- 

 niferous strata'^ have been partially meta- 

 morphosed, and invaded by greenstone and 

 other igneous rocks. A mass of granite, con- 

 taining dark grey felspar, abundance of black 

 mica and very little quartz, occurs on the 

 east side of Mount Thom. 



The Cobequid hiUs, extending nearly in 

 an east and west direction for about ninety 

 miles in that part of Nova Scotia h*ing north 

 of the southern ami of the Bay of Fundy, 

 must be referred to the metamorphic group 

 now under consideration. Both its strati- 

 fied and hypogene rocks are similar to those 

 of the parts of the syenitic group already 

 described. Fossils are absent or veiy rare 

 in those parts of it which I have explored. 

 I have found only a few fish-scales, and 

 fragments of a Productus or Orthis in cal- 

 careous bands associated with black slate 

 and brown quaitzite, near its eastern extre- 

 mity. As the boundaries and general cha- 

 I g racters of the Cobequid range have long 

 since been described by Dr. Gesner and 

 others, and as I have in a former paper f 

 noticed the structm-e of its eastern part, I 

 shall at present confine myself to a descrip- 

 tion of the section of its central portion, 

 afforded by the Great Tillage, Folly, and 

 Wallace rivers, and the roads in their vici- 

 nity. (See Section, fig. 3.) 

 On the northern side of the hills, near the post road from Truro 



- £ c 



li 

 II 



Northumberland Strait. 



* In the map attached to my paper on the Newer Coal Formation (Quart. Journ. 

 Geol. Soc. 1845, vol. i. p. 322), some spaces in the south of Pictou and Col- 

 chester counties, occupied by hypogene and old metamorphic rocks, are coloured 

 as carboniferous. These spaces, being then unexplored, were left uncoloured by 

 me ; but the colourist extended the carboniferous tint over them. 



t Quart. Journ. Geol. Soc. vol. i. p. 27. 



