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Updated: May 16, 2025
On two sides of the room, where the junction of the concrete floor with the bounding walls could be carefully examined, there was no crack or separation. The two thin beds of black mould at the bottom of the trench evidently marked two former land-surfaces.
But, reasoning from experience and the reports of travellers, there was nothing to suggest to early man the limit of the earth. He did, indeed, find in his wanderings, that changed climatic conditions barred him from farther progress; but beyond the farthest reaches of his migrations, the seemingly flat land-surfaces and water-surfaces stretched away unbroken and, to all appearances, without end.
Schroeter, presenting not only the profile but the comparative elevations of the land-surfaces or continents and islands, and, in detail, of the several political divisions of the globe, thus at once making the ocular study of geography real, and not as formerly, leaving the right conception of the land-surfaces to the pupil's unaided imagination.
Professor Barnard, with the Lick thirty-six inch telescope, discerned an astonishing wealth of detail on the surface of Mars, so intricate, minute, and abundant, that it baffled all attempts to delineate it; and these peculiarities were seen upon the supposed seas as well as on the land-surfaces.
But such is the tremendous power of the Atlantic billows when impelled by westerly winds, that to their agency must be mainly attributed the small size of the volcanic land-surfaces as compared with their original extent, and the formation of those grand headlands which are presented by the igneous masses of Skye, Ardnamurchan, and Mull towards the west.
LeConte, in his Geology, p. 19, says, "Making due allowance for all variations, it is probable that all land-surfaces are being cut down and lowered by rain and river erosion, at a rate of one foot every 5,000 years.
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