The book A College Text-Book of Geology was written by author Thomas C Thomas Chrowder Chamberlin Here you can read free online of A College 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 A College Text-Book of Geology a good or bad book?
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In other continents the Ordovician strata have not always been separated from the overlying Silurian, but they are known both in Australia and China. Duration and Climate The duration of the Ordo\dcian is perhaps no better known than that of the Cambrian, but the period was probably somewhat shorter than its predecessor. Neither in Europe nor in America is there decisive evidence that climatic zones were distinctly marked. All that is known of the life of this area would seem to indicate that t...he climate was much more uniform than now throughout the areas where the strata of the period are known. The fact that the Ordovician rocks have ^ Systeme Siluriene de la Boheme. 2 Quart. Jour. Geol. Soc, 1884 and 1888. THE ORDOVICIAN PERIOD 521 been identified in the far north (in North Devon, the west coast of King Wilham's Land, Boothia, etc.) by fossils akin to those of low latitudes, indicates that the climatic conditions of North America and Europe must have been less diversified than now.
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