On the Cause, Date, And Duration of the Last Glacial Epoch of Geology, And the Probable Antiquity of Man
On the Cause, Date, And Duration of the Last Glacial Epoch of Geology, And the Probable Antiquity of Man
Alfred Wilks Drayson
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Thus, for example, between the Sharp and Broad mountains there are sixty-five seams, each of which is separated by what we may term a glacial epoch, or period of 31,000 years, thus making a period of above 2,000,000 years for these alone. When we consider what there is between the coal-measures and the boulder period, there is time in plenty for those who insist on these vast epochs. Sir C. Lyell, in Antiquity of Man^ page 285, calcu- lates that the submergence of Wales to the amount of 1400 fe...et would require 56,000 years; but if 800 feet more submergence took place, an additional 32,000 years would be required, amounting in all to 88,000 years. * Philosophical Transactions, 1860. Digiti ized by Google ASTRONOMICAL AND GEOLOGICAL TIME, 251 But this result is arrived at only by assuming 2^ feet per century to be the rate at which this sub- mergence occurred. If the rate were greater, as it probably would have been when the climatic con- ditions were very different, the number of years would be very different.
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