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Having listened with much pleasure to several able lectures on Geology and Palæontology which have already been delivered in this Hall, I believe I am correct in affirming, that the general tendency of these discourses has been altogether in one direction; the object being, to impress forcibly upon your minds the opinion that the various changes which have taken place in the earth's history, inhabitants, and surface configuration, have been mainly effected by what may be termed external agencies, i.e., by forces acting from without, slow but sure in their operations, yet but comparatively so feeble in their energy as to demand a practically unlimited amount of time being placed at their disposal to enable them to accomplish those great revolutions which we see and know to have taken place in the geological history of our globe.
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- Copyright © Cambridge University Press 1870
Footnotes
3
Being the substance of a lecture delivered in St. George's Hall, June 19, 1870.
References
1 In Ireland also there are at least two or three sets of terraces that were formed subsequent to the disappearance of the mass of the ice, but probably prior to the final disappearance of the snow on the uplands and the ice-streams in the hill valleys. (See Memoir Geol. Survey, Ireland, ex. sheet, 105.)
2 There are sloping terraces on some of the hill-sides of Devon and Cornwall, but whether they occur in systems, and consequently are due to marine action, has still to be worked out.