1 84 



(427 m.) of strata are represented in this section, but it is 

 difficult to get an accurate measurement on account of 

 the foldings and contortions within the beds. A leading 



fossil is Schizodns. 







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A typical view of the Upper Banff shale, exposed in Spray valley at Banff. 



JURASSIC. 



Fernie Shale. — No sharp line can be drawn between 

 the Upper Banff and Fernie shales, except where fossils 

 are found. The Fernie formation consists of black and 

 dark brown, siliceous, very thinly laminated shales which 

 break up into small fragments on the weathered surface. 

 West of Banff it has a limited distribution, lying on the 

 Upper Banff shale. East of Banff and on the north side 

 of the Cascade trough, it forms a band about 1,500 feet 

 (457 m.) thick. The Fernie shale was examined near 

 Exshaw 6 miles (9-6 km.) east of the Gap. A certain 

 layer was found to contain clay concretions of which the 

 largest was 35 cm. in diameter. Another layer, 15 cm. 

 thick, contained numerous bone fragments. One large 

 reptile-like jaw-bone is 22 cm. long. There are many 

 smaller fragments of bone and teeth. Ammonites are 

 very common in the Fernie shale. 



