Page:Popular Science Monthly Volume 34.djvu/36

26 paleolithic stage began toward the close of the later cold epoch and extended well toward the historic period, probably overlapping far upon the neolithic stage. Thus the place of paleolithic man in the chronograph afforded by geology is that shown in Fig. 1.

It should be pointed out that the human period of America can not be synchronized with that of Europe, since the geologic chronometer employed abroad is not sufficiently sensitive. It is true that Penck and others have recently read from the glacial and associated deposits of the Alps a climatal record coinciding exactly with that recognized in this country (save that the duration of the episodes is less closely measured), and that Mortillet and others have inferred a definite climatal sequence from the