Publisher's Synopsis
Excerpt from Bulletin of the Mount Weather Observatory, 1913, Vol. 6
Old lake beaches, glacial moraines, and various other geological records give indisputable evidence of numerous climatic changes. It appears too that these changes Were irregular in their times of occur rence and irregular also in their intensity and duration. Many seem to have been mild and relatively ?eeting, While a few were so profound and lasting as even to bring on ice ages and to cover extensive areas of the earth with glacial sheets, or, on the other hand, to melt these sheets away and to establish for long periods warm and genial climates over much the greater portion of the earth.
When this series of climatic changes began there is no sure means of knowing, for the records, especially those of glacial origin, grow gradually fainter and more scanty with increase of geological age, and it is probable therefore that the effects of many of the earlier changes have long since been completely obliterated. But, however this may be, it is well nigh certain that from the time of the earliest known of these changes down to the very present the series has been irregularly continuous, and the end, one might reasonably assume, is not yet. Change after change of climate in an almost endless succession, and even additional ice ages, presumably are still to be experienced, though, except small and ?eeting changes to be noted below, when they shall begin, how intense they may be or how long they shall last no one can form the slightest idea.
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