The book Lectures On Biology was written by author Robert W Robert Wilson Shufeldt Here you can read free online of Lectures On Biology book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Lectures On Biology a good or bad book?
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The area of this coal-basin is 18, 000 square miles; but the identity in character of portions now widely separated by seas e. G. , on Prince Edward's Island, Cape Breton, Magdalen Island, etc. Plainly shows that ail these are parts of one original field, which could not have been less than 30, 000 square miles. "At Pictou, the thickness is nearly 13, 000 feet, and we certainly shall not err on the side of excess, therefore, if we take the average thickness over the whole area of 7, 500 feet. T...his would give the cubic contents of the original delta deposit as about 51, 000 cubic miles. Now, the Mississippi River, according to Humphrey and Ab- bott, carries to iis delta annually sediment enough ta cover a square mile 268 feet deep, or nearly exactly one- twentieth of a cubic mile. Therefore, to accumulate the mass of sediment mentioned above would take the Mis- sissippi about 1, 000, 000 years. " And, mark you, in the geological series of the earth's crust the Carboniferous period is not more than one- thirtieth of her recorded history.
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