The physical geography of New York state . PIG. 145. A birds-eye view of Niagara (after Gilbert). turns nearly at right angles, after which it narrows andbroadens in one or two places, being especially narrow atFoster Flats. Throughout this lower half of the gorge tin*current is prevailingly rapid, and the depth evidently muchless than that above the Whirlpool Rapids. Gilbert1 makesthe following estimate of the depth of the river at variousplaces. At the Whirlpool Rapids, 35 feet; at the outlet. FlG. 140. The i?or^c of Ni:i^??i. with tin- r;i|.|.ini, «>! Ni:ii:??i limestone H shown mi Ihr r
The physical geography of New York state . PIG. 145. A birds-eye view of Niagara (after Gilbert). turns nearly at right angles, after which it narrows andbroadens in one or two places, being especially narrow atFoster Flats. Throughout this lower half of the gorge tin*current is prevailingly rapid, and the depth evidently muchless than that above the Whirlpool Rapids. Gilbert1 makesthe following estimate of the depth of the river at variousplaces. At the Whirlpool Rapids, 35 feet; at the outlet. FlG. 140. The i?or^c of Ni:i^??i. with tin- r;i|.|.ini, «>! Ni:ii:??i limestone H shown mi Ihr riirht. of the Whirlpool, 50 feet; opposite \ Klat,feet; and below Foster Flat, 70 feet. Tin- drptli of iln-Whirlpool is to be aboul 15il feet. lAmer. Geologist, XVIII, ;;. -j:!L-233. 272 The Physical Geography of New York State After a passage of about seven miles through the gorge(Figs. 146, 147, 158 and 160), alternately expanding andcontracting, and with the current now moderate and nowrapid, and in places even violently rapid, the river emergesfrom its cafion (Fig. 159) and passes peacefully across thelower plain, in a valley somewhat broader than the gorge,and bounded by low banks rising to the level of the lowerplain. Throughout its gorge the river is everywhere boundedby rock walls, excepting in one place, the Whirlpool,
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