THE DEVONIAN SERIES. 



291 



seventeen to forty per cent, of the carbonate of that 

 alkaline earth." 



******* 



" On the south shore of that lake (Winnipeg), however, 

 I again had an opportunity of inspecting fossiliferous lime- 

 stones in situ. At the two localities where I succeeded 

 in obtaining a view of them, they were much disturbed, 

 dipping either at a high angle, or standing vertically. On 

 Poplar Point, they are quite thin-bedded, and contain, be- 

 sides small Entrochites, large varieties of Endoceras. In a 

 small bay, near Big Swamp Point, the limestone is seen 

 jutting out beneath heavy, loose masses of crystalline 

 rocks, some of which weigh hundreds of tons. The 

 surfaces of many of the limestone slabs at this locality are 

 crowded with well-preserved specimens of the character- 

 istic fossil Leptcma alternates" 



THE DEVONIAN SERIES. 



In consequence of the extreme flatness of the country 

 the junction of the Silurian and Devonian Series has been 

 only approximately determined, chiefly by the occur- 

 rence of the saline springs which distinguish the Devonian 

 Series in this region. In all cases where saline springs 

 were seen issuing from rock in position, Devonian forma- 

 tions were recognized by characteristic fossils. The 

 parallelism between the courses of Moss Eiver, Waterhen 

 Eiver, Partridge Crop Eiver, and Dauphin Eiver, suggests 

 at once the line of junction or a dislocation ; if the former, 

 their courses probably indicate the junction of different 

 Devonian or Silurian formations, but in no instance the 

 limits of either series, as was ascertained by the charac- 

 teristic fossils found at different localities on those rivers. 



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