100 



resemble very much those of Grenville on the Ottawa. They abound 

 in veins of chrysotile, present a very rough weathered surface, and ap- 

 pear to be devoid of Eozoon. 



In North Burgess, which adjoins Dalbousie, is found massive and 

 uearly pure serpentine. Eozoon Oanadense has been found in the ser- 

 pentine limestone of this township, from which are also reported pure 

 dolomites, with grains of steatitic pyroxene and green or yellowish- 

 green serpentine, also accompanied by Eozoom. 



About 20 miles farther south, and in the township of Loborough, 

 county of Frontenac, white and coarsely crystalline dolomite is seen on 

 lot 4, range X. This dolomite leaves, when dissolved in acids, a i*esi- 

 due of quartz and serpentine, and contains traces of oxyd of iron and of 

 phosphate. 



Serpentine of probable Lauren tian ago is believed to occur on Wol- 

 laston or Hatchet Lake, as well as at the head of Reindeer Lake. Dr. 

 Lawson reports having met serpentine in the Keewatin area, on the 

 west side of Clear Water Lake, a tributary of Rainy Lake. This rock 

 is massive and occurs there in a band, immediately followed to the west 

 by hornblende schist and to the east by another band of green horn 

 blendic schists and altered traps. Another mass of serpentine, in very 

 analogous position, is seen on South Bay of Lake Despair, and Dr. Law- 

 son reports this as occurring with some degree of constancy in the middle 

 portion of the Keewatin trough, and thinks these serpentines are the 

 altered remains of olivine rocks. A small boss of this rock has also 

 been examined by tne same gentleman at the south-west end of Sucker 

 Lake, coming in with green schist. Dr. Lawson, speaking of the serpen, 

 tines of the Keewatin area of the Lake of the Woods, says : 



" This interesting class of rocks is not of extensive occurrence in 

 this area, but is found irregularly distributed in patches of rather ill- 

 defined character and extent." Of the Wiley Point serpentines he 

 speaks thus : 



" The quartz-poiphyry occupies the greater portion of a small island 

 two and three-quarters miles south-west of Wiley Point, and is evidently 

 associated with a mass of serpentine which occupies a small island beside 

 the north, and the neighboring point on the main shore a little to the 

 south-west. The serpentine on this point presents no definite relations 



