. The street railway review . -accurate for general purposes ; a more exact figure is miles per week. The international boundary line is inthe middle of the so-called Canadian Fall. Below the Fallsthe river is from 1,000 to 1,200 ft. wide, but two miles belownarrows to 800 ft. and farther down at the WhirlpoolRapids to 230 ft. Within seven miles below the Falls the. total fall is over 100 ft. The several strata which areexposed in the gorge are gray quartzose sandstone, redshaly sandstone, gray mottled sandstone, green shale, com-pact gray limestone, soft shale and limestone in the o
. The street railway review . -accurate for general purposes ; a more exact figure is miles per week. The international boundary line is inthe middle of the so-called Canadian Fall. Below the Fallsthe river is from 1,000 to 1,200 ft. wide, but two miles belownarrows to 800 ft. and farther down at the WhirlpoolRapids to 230 ft. Within seven miles below the Falls the. total fall is over 100 ft. The several strata which areexposed in the gorge are gray quartzose sandstone, redshaly sandstone, gray mottled sandstone, green shale, com-pact gray limestone, soft shale and limestone in the ordernamed. Because of the dip in the land from north to souththe water in cutting out the gorge has encountered in suc-cession strata of varying degrees of hardness and the rateof recession of the Falls had varied in consequence. From1S42 to 1S90 the average rate of recession was ft. peryear on the Canadian side and ^j ft. per year on the Ameri-can side. At present the rock at the crest is limestone withshale about 90 ft. below. Geologists state that a fartherrecession of two miles will cut away all the limestone andleave the Falls stationary on sand stone with the heightreduced 50 per cent; the fall when the river first took itspresent route to Lake Ontario was about 300 ft. or twice asmuch as at the present time. To properly do the Falls one should start from Pr
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
