Lectures On Biology
Lectures On Biology
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In our eReader you can find the full English version of the book. Read Lectures On Biology Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Lectures On Biology
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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.
What to read after Lectures On Biology?
You can find similar books in the "Read Also" column, or choose other free books by Robert W Robert Wilson Shufeldt to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
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.
What to read after Lectures On Biology?
You can find similar books in the "Read Also" column, or choose other free books by Robert W Robert Wilson Shufeldt to read onlineMoreLess
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