The Geological Evidences of the Antiquity of Man, With Remarks On Theories of the Origin of Species By Variation
The book The Geological Evidences of the Antiquity of Man, With Remarks On Theories of the Origin of Species By Variation was written by author Lyell, Charles, Sir, 1797-1875 Here you can read free online of The Geological Evidences of the Antiquity of Man, With Remarks On Theories of the Origin of Species By Variation book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Geological Evidences of the Antiquity of Man, With Remarks On Theories of the Origin of Species By Variation a good or bad book?
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I have visited the spot, which has been correctly described by Mr. Prestwich.* The section of the Bedford tool-bearing alluvium, given at p. 164, may serve to illustrate that of Icklingham, if we sub- stitute chalk for oolite, and the river Lark for the Ouse. In both cases, the present bed of the river is about thirty feet below the level of the old gravel, and the chalk hill, which bounds the valley of the Lark on the right side, is capped like the oolite of Biddenham by boulder clay, which ri...ses to the height of one hundred feet above the Lark. About twelve years ago, a large erratic block, above four feet in diameter, was dug out of the boulder clay at Icklingham, which I found to consist of a hard siliceous schist, apparently a Silurian rock, which must have come from a remote region. The tool-bearing gravel here, as in the case to which it has been oompared near Bedford, is proved to be newer than the glacial drift, by containing pebbles of basalt and other rocks derived from that formation.
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