. The Niagara book : a complete souvenir of Niagara Falls : containing sketches, stories and essays--descriptive, humorous, historical and scientific. rk and in the adjacent parts ofthe continent, and which most properly bears the nameof Niagara Limestone, there is a less considerablethickness of thin-layered shaley beds known as the Niagara Shale. Yet below lie beds of the ClintonAge, composed of somewhat coherent limestone shalessandstones. At the base of the section of the Falls andsteep, occupying more than half of its height, are thebeds of the Medina formation, mostly made up ofrather fr
. The Niagara book : a complete souvenir of Niagara Falls : containing sketches, stories and essays--descriptive, humorous, historical and scientific. rk and in the adjacent parts ofthe continent, and which most properly bears the nameof Niagara Limestone, there is a less considerablethickness of thin-layered shaley beds known as the Niagara Shale. Yet below lie beds of the ClintonAge, composed of somewhat coherent limestone shalessandstones. At the base of the section of the Falls andsteep, occupying more than half of its height, are thebeds of the Medina formation, mostly made up ofrather frail sandstones and thin reddish shaley what the reader can see in the Cave of theWinds, and what he can readily infer by observing therocks bared in the cliffs near the Falls, he will readilyunderstand that the Niagara Limestone is the rockwhich takes the brunt of the work required in main-taining the precipice, down which its river will see also that this hard edge of the cHff pro-jects beyond its base, thus giving free room for thefall to descend unbroken to the level of the stream %:^S^. ji m. i\ iiiiSil );s, -f fill. tfrjiijKMSU iiitl iU] :j\:\j IWmi wm,. mm llfMm: &: ?J: qmimmm 84 THE GEOLOGY OF NIAGARA FALLS. below, and thence downward in the tumult of watersto the river bed to a greater depth than the visibleface of the Falls. From time to time as abundant general observa-tions and accurate surveys show, the Niagara corniceof the wall is so far left unsupported by the more rapidwearing of the lower-lying softer beds that it breaksdown by its own weight and falls in ruins to the baseof the submerged cliff at the foot of the cascade. Inthis position we cannot see what becomes of the debris,but from what we may readily observe at other pointswe can make some interesting and trustworthyinferences. Along many rivers the student of suchphenomena can find places where ancient cata-racts have left their bases bare by the shrinkage ordiversion of the s
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