85 



evidence that these Huronian rocks had been considerably 

 weathered before the deposition of the Lowville, and that 

 the topography probably had become sufficiently dissected 

 to give rise to ranges of hills or low mountains comparable 

 in direction and altitude to those which now traverse the 

 region. 



Cloche Island. 



An excellent section of the Mohawkian strata is ex- 

 posed along the line of railway from Cloche peninsula, 

 across Cloche island and Goat island to Little Current. 



Lowville. — The lowest Palaeozoic strata, exposed for 

 several miles (4 or 5 km.) along the western margin of 

 the Cloche peninsula, consist of red shales of Lowville 

 age. Only the upper part of these shales, 70 feet (21 m.) 

 thick, are exposed above lake level. Fossils are found a 

 mile (i-6km.) south of the northwestern angle of the 

 peninsula, in a hard brownish clay stratum a short distance 

 above the level of the railway. The southward dip of the 

 strata is sufficient to carry them below lake level about 

 a mile before Swift Current is reached. The following 

 species are to be obtained from the hard brownish stratum : 



Pterotheca cf. attenuata (Hall). 



Cyrtodonta cf. janesvillensis ( Ulrich.) 



Archinacella sp. 



Lingula sp. 



Leray member of Lowville. — The overlying strata 

 consist chiefly of soft whitish limestones of variable char- 

 acter, which are reddish only where near one of the Pre- 

 Cambrian quartzite ranges or knolls, whose weathered 

 surfaces furnished the ferruginous matter included in the 

 later strata. These limestones are referred to the Upper 

 or Leray division of the Lowville, and terminate, at the top, 

 in a series of very fine grained, much harder limestones, 

 11 feet (3-3 m.) thick, resembling the "Birdseye" limestone 

 of New York. These "Birdseye" limestones are exposed 

 at intervals for a distance of almost a mile along the rail- 

 way south of Swift Current, and contain very few fossils. 

 The immediately underlying strata, exposed along the 

 same stretch of railway, especially in the immediate 

 vicinity of Swift Current, where they rest directly on a 

 quartzite knoll, contain a fauna sufficient to identify the 



