The book Introductory Text book of Geology was written by author David Page Here you can read free online of Introductory Text book of Geology book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Introductory Text book of Geology a good or bad book?
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; but the main masses of the American rocks of the system are of the Devonian type. RECAPITULATION. RECAPITULATION. 214. The system we have now reviewed, under the title of the Devonian or Old Red Sandstone, is one of the most re- markable in the geological record. In Britain its strata are of two wholly distinct types. The northern type consists of coarse conglomerates, red sandstones, and marls presumably laid down in fresh-water lakes or brackish lagoons and yield- ing an abundance of fishes... of a most peculiar type (Ganoids), covered with hard enamelled scales, or with bony plates, or armed with strong spines ; and associated with gigantic crus- tacea (Eurypterites), somewhat allied to the modern king-crab. To the northern type the name of Old Red Sandstone is gener- ally applied. Its rocks are separable into an Upper and Lower Division unconformable with respect to each other, but graduating, the one upwards into the Carboniferous, the other downwards into the Silurian. The southern type of the system is known as the Devonian, from the county where its strata are best displayed.
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