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Report and Transactions of the Devonshire Association for the Advancement of Science, Literature, and Art, Vol. 2: Barnstaple, July, 1867; Part I (Cla: Barnstaple, July, 1867; Part I (Classic Reprint) - Softcover

Assoc, Science Advancement Devonshire

 
9780282546021: Report and Transactions of the Devonshire Association for the Advancement of Science, Literature, and Art, Vol. 2: Barnstaple, July, 1867; Part I (Cla: Barnstaple, July, 1867; Part I (Classic Reprint)

Inhaltsangabe

Excerpt from Report and Transactions of the Devonshire Association for the Advancement of Science, Literature, and Art, Vol. 2: Barnstaple, July, 1867; Part I

In determining the relative ages of rocks the geologist relies on certain trustworthy tests. Thus, he is confident that, where he has a clear case of superposed strata, every bed is older than those overlying, and more modern than those underlying, it; that a conglomerate is more recent than the rocks which furnished the pebbles of which it is made up; that the rocks which, in the forms of dykes and veins, invade other rocks, are more modern than those invaded and that strata lithologically similar, found in localities not widely separated, and charged with the same species of fossils, are geological contemporaries.

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