65 



associated with the limestone conglomerate at Bic and 

 resemble the sandstones and associated conglomerate of 

 other localities. 



The sandstones of division 4, are, apparently, conform- 

 able with the shales of division 3. If, as the single fossil 

 species seems to indicate, the shales are of Levis age, then 

 the quartzites are also of this age. The strata of divisions 

 2 and 1 seem to be conformable, though locally separated by 

 a break. The fossils recovered from division 1 indicate 

 that the strata are not older than Upper Cambrian: they 

 may be of approximately the same age as divisions 2 

 and 4. 



The structures exhibited by the strata of division 2 in 

 the cliff face below the falls — the gradual change in attitude 

 from an inclined one to a nearly horizontal, plicated one, 

 and the fact that the zone of plications does not bear any 

 evident relation to the plane of the thrust fault — indicate 

 that the measures lie in a deformed, overturned anticlinal 

 fold, which during the process of folding was plicated at 

 the apex. If this be so, then, as the existence of the 

 thrust fault and the uniform direction of the dip of the 

 strata both above and below the fault indicate, a thrust 

 fault developed after the fold was overturned, whereby the 

 upper portion of the recumbent fold was thrust forward over 

 the overturned, lower limb so that stratigraphically lower 

 measures came to lie on stratigraphically higher measures. 

 This general conclusion apparently is supported by the 

 somewhat meager fossiliferous evidence so far obtained. 

 If the above suppositions are correct, it follows that the 

 quartzites of division 4, are the youngest strata exposed 

 in the section and not, as at one time thought, the oldest. 

 On the above general grounds, the true order of succession 

 of the strata of the section in descending order is, — 



Division 4, grey quartzose sandstones with interbedded 

 dark grey shales. 



Division 3, dark grey shales. 



A section of strata unrepresented because of the presence 

 of thrust fault. 



Division 1, red , green and dark shales, with beds of 

 limestone conglomerate, limestone and sandstone. 



Division 2, interbedded dark, grey shales and light 

 coloured sandstones. 

 35063—5 



