. Elements of geology : a text-book for colleges and for the general reader. Geology. 616 PSYCHOZOIC ERA—AGE OF MAN—RECENT EPOCH. significant, however, that the elephant-tracks, also, formed but two series. The weight of evidence is probably in favor of the mylodon, but in any case there seems no reason to believe the age of the strata to be earlier than the Quaternary. The only reason for assigning them to an earlier period (Pliocene) is their lithified condition. But the pres- ence in the quarry of hot springs, containing abundance of lime-carbon- ate, sufficiently accounts for this. Quatern
. Elements of geology : a text-book for colleges and for the general reader. Geology. 616 PSYCHOZOIC ERA—AGE OF MAN—RECENT EPOCH. significant, however, that the elephant-tracks, also, formed but two series. The weight of evidence is probably in favor of the mylodon, but in any case there seems no reason to believe the age of the strata to be earlier than the Quaternary. The only reason for assigning them to an earlier period (Pliocene) is their lithified condition. But the pres- ence in the quarry of hot springs, containing abundance of lime-carbon- ate, sufficiently accounts for this. Quaternary Man.—Leaving out all doubtful cases, the first appear- ance of man in America seems to have been about the same time as or, perhaps, a little later than in Europe. On the Pacific coast his implements are found in great abundance in river-gravels, associated with remains of the mammoth, the great mastodon, and the horse. On the Eastern part of the continent, also, the existence of man before the ice-sheet had disappeared from the United States, is distinctly proved. One of the best examples of this is found in the discovery by Miss Babbitt, at Little Falls, Minnesota, of rude flint implements in deposits, which were formed during the final retreat of the ice-sheet from that region.* Another good example, is the discovery by Abbott, in gravels near Trenton, New Jersey, of rude flint implements, similar to Palaeolithic implements everywhere. The gravels are acknowledged to have been formed during the retreat of the ice-sheet from New Jer- sey. We give here a figure of one of these flints (Fig. 980). Still more recently hu- man implements have been found in Ohio, under conditions which prove that man lived there while the northern part of the Mississippi Valley was still ice- sheeted (Wright). There seems to be no doubt, there- fore, that in Amer- ica, as in Europe, lakes and rivers of. Fig. 980. -Palteolith found bv Abbott in New Jersey, slightly reduced (after Wright).
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