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" Silurian series), about ninety feet thick, beneath which lie soft shales of equal thickness, continually undermined by the action of the spray, which rises from the pool into which so large a body of water is projected, and is driven violently by gusts... "
Report of the Marlborough College Natural History Society (founded April 9th ... - Seite 61
von Marlborough College (Marlborough, England). Natural History Society - 1867
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Elements of Geology: Prepared for the Use of Schools and Colleges

William Samuel Waithman Ruschenberger - 1846 - 235 Seiten
...beneath which lie soft shales of equal thickness, continually undermined by the action of the spray, driven violently by gusts of wind against the base of the precipice. In consequence of this disintegration, portions of the incumbent rock are left unsupported, and tumble down from time to time,...
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Principles of Geology: Or, The Modern Changes of the Earth and Its ...

Sir Charles Lyell - 1847 - 824 Seiten
...continually undermined by the action of the spray, which rises from the pool into which so large a body of water is projected, and is driven violently by gusts...disintegrates and crumbles away, and portions of the incumbent rock overhang 40 feet, and often when unsupported tumble down, so that the Falls do not remain absolutely...
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Sketches on a Tour Through the Northern and Eastern States, the Canadas ...

J. C. Myers - 1849 - 475 Seiten
...their softness, are continually undermining by the action of the spray, driven violently by gin'.s of wind against the base of the precipice. In consequence of this disintegration, portions of the incumbent rock are left unsupported and tumble down from time to time,...
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The chemistry of creation

Robert Ellis (F.L.S.) - 1850
...beneath which lie soft shales of equal thickness, continually undermined by the action of the spray driven violently by gusts of wind against the base of the precipice. In consequence of this disintegration portions of the incumbent rock are left unsupported, and tumble down from time to time,...
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Principles of Geology: Or, The Modern Changes of the Earth and Its ...

Sir Charles Lyell - 1854 - 834 Seiten
...continually undermined by the action of the spray, which rises from the pool into which so large a body of water is projected, and is driven violently by gusts of wind against the base of the * The reader will find in my Travels in North America, vol. i. ob. 2, a colored gcological map and...
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Elementary Course of Geology, Mineralogy, and Physical Geography

David T[homas] Ansted, David Thomas Ansted - 1856 - 606 Seiten
...continually undermined by the action of the spray, which rises from the pool into which so large a body of water is projected, and is driven violently by gusts...disintegrates and crumbles away, and portions of the incumbent rock overhang 40 feet, and often, when unsupported, tumble down ; so that the Falls do not remain absolutely...
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Principles of Geology: Or, The Modern Changes of the Earth and Its ...

Sir Charles Lyell - 1872
...continually undermined by the action of the spray, which rises from the pool into which so large a body of water is projected, and is driven violently by gusts...disintegrates and crumbles away, and portions of the incumbent rock overhang forty feet, and often when unsupported tumble down, so that the Falls do not remain absolutely...
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Scepticism in geology and the reasons for it, by Verifier

John Murray - 1877
...beneath which lie soft shales of equal thickness, continually undermined by the action of the spray . , . driven violently by gusts of wind against the base...precipice. In consequence of this action, and that of the frost, the shale disintegrates and crumbles away, and portions of the incumbent rock overhang 40...
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Scepticism in Geology and the Reasons for it: An Assemblage of Facts from ...

Verifier (pseud.), John Murray - 1878 - 132 Seiten
...continually undermined l>y the action of the spray, which rises from the pool into which so large a body of water is projected, and is driven violently by gusts...precipice. In consequence of this action, and that of the frost, the shale disintegrates and crumbles away, and portions of the incumbent rock overhang 40...
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Scepticism in geology and the reasons for it, by Verifier

John Murray - 1878
...continually undermined ~by the action of the spray, which rises from the pool into which so large a body of water is projected, and is driven violently by gusts of wind against the bose of the precipice. In consequence of this action, and that of the frost, the shale disintegrates...
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