. Edinburgh New Philosophical Journal . O Lake Ontario; E Lake Erie; Q, Queenston; G termination of the ra- vine ; a the Falls seven miles from G; b the probable future place of the Palls when they will be in the strata c and d, and not, as at present, in d and e\ c siliceous limestone, d geodiferous limestone, e friable shale. The vertical scale is of course greatly exaggerated beyond the actual proportions, it being in all such diagrams impossible to represent the distances and the heights in their true ratios. A still further retrogression will bring the cataract altogether out of the infer
. Edinburgh New Philosophical Journal . O Lake Ontario; E Lake Erie; Q, Queenston; G termination of the ra- vine ; a the Falls seven miles from G; b the probable future place of the Palls when they will be in the strata c and d, and not, as at present, in d and e\ c siliceous limestone, d geodiferous limestone, e friable shale. The vertical scale is of course greatly exaggerated beyond the actual proportions, it being in all such diagrams impossible to represent the distances and the heights in their true ratios. A still further retrogression will bring the cataract altogether out of the inferior shale, the thickness of which at present is ninety feet, and will cause the escarpment of the Falls to con- sist only of the overlying limestone beds, and ultimately of a still superior stratum, a tough siliceous limestone which occupies the surface from Lake Erie down almost to the Falls. It seems a plausible conjecture, that entering, as it thus certainly must, a new series of beds possessing very different relations of hardness, friability, and thickness, from those which compose the present escarpment, both the rate and the mode of retrogression will be materially modified. Should the upper stratum, instead of be- ing, as it now is, the hardest, become, as it possibly may, be.
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