4i 



separated fragments. A considerable amount 

 of local solution and redeposition has also taken 

 place, as shown by the presence of a coarse- 

 grained development of the gneissic bands along 

 certain irregular lines often running transverse 

 to the bedding. 



This area of blue limestone, with its pure 

 and impure bands, under a more intense meta- 

 morphism, such as that to which the more 

 northerly portion of the district has been sub- 

 jected, would develop into a series of coarsely 

 crystalline white limestones, with interstratified 

 bands of the rusty biotite-bearing gneisses, 

 which are so extensively exposed elsewhere in 

 the district, and which are so commonly found 

 in all developments of the Grenville series in 

 Canada. Such an occurrence as this, therefore, 

 represents the Grenville series, in a less altered 

 form. 

 284-29 m. Millbridge Corners is between lots 20 and 

 457-5 km. 21, Hastings road. Before the building of the 

 railway this road was one of the main highways 

 of communication, but is now little used, except 

 for local purposes. It crosses the strike of the 

 rocks nearly at right angles, however, and thus 

 affords a good cross section. 



At the "Corners" the bluish limestone is 

 much contorted and nearly vertical in attitude. 

 Very narrow, lenticular bands of white calcite 

 are being developed as a result of recrystalliza- 

 tion. 

 285-54 m - From lot 25 to lot 33 the road passes through 

 459 • 5 km. a swampy tract with exposures of similar lime- 

 stones at intervals. The beds, which are nearly 

 vertical, dip sometimes to the south, but 

 usually in a northerly direction. In places veins 

 of quartz together with some dolomite, inter- 

 sect the limestone. On lot 32 the limestone is 

 lighter in colour, owing to more advanced 

 metamorphism. Between lots 33 and 36 the 

 limestones are inclined at a very high angle to 

 the south. 



This limestone succession is interrupted on 

 lot 40 by an intrusion of diorite. The limestone 



