4 6 



been mistaken for an iron ore, which contains hornblende. 

 Carbonates are also absent, except in traces, and the iron 

 is thus present almost exclusively in the form of a dissemi- 

 nated sulphide, the rocks belonging to die ordinary rusty 

 weathering paragneisses so extensively distributed through- 

 out the sedimentary portion of the area. 



Annotated Guide — continued. 



308 -8 m. Brinklow. 



497 km. 



315-5111. Turriff. Alt.: 1,098 ft. (334 -6m.) 



507-7 km. 



319-76 m. L'Amable Alt.: 1,073 ft. (327 m.). 



514-6 km. 



The railway here runs through an old "bruie," 

 with heavy rock cuttings in white crystalline 

 limestone. The valleys between the rocky 

 ridges are occupied by extensive deposits of 

 sand and gravel. In the vicinity of L'Amable 

 station "feather" amphibolite (see page 24) 

 is seen interstratified with thinly-bedded crys- 

 talline limestones. 



323-09 m. Bronson. Alt. 1,077 ft. (328-2 m.). The 



518-9 km. first rock cut to the east of this station is in a 

 typical crystalline limestone of the Grenville 

 series. It is distinctly bedded and remarkably 

 free from impurities. Some of the beds still 

 retain some of their originally bluish-grey 

 colour. The action of the weather is very 

 characteristically shown in this exposure. Auto- 

 clastic action is illustrated in the dislocation of 

 certain dykes of pegmatite intrusive with the 

 limestone, the limestone very evidently being 

 much more plastic than the pegmatitic material. 

 A short distance west of Bronson station the 

 railway siding employed by the Ontario Marble 

 Quarries, Limited, is reached. These quarries, 

 which are situated on lots 29 and 30, con. X of 

 the township of Dungannon, and lots 41 and 42 

 of the Hastings road, Township of Faraday, 

 yield a great variety of ornamental marbles, 

 including breccias of veined, streaked and 



