CHAPTEK X. 
WHEN DID MAN APPEAR? 
This is the most interesting question that geology 
has to deal with. There is an abundance of evidence 
in geological deposits of the existence of man many 
years ago. But how many years is still very indef¬ 
inite. 
It has been claimed that man existed as far back 
as Miocene times. The Miocene evidences are these : 
scratches on bones and rude flints. The marks on the 
bones might have been made by the teeth of flesh- 
eating animals, and the flints could have been acci¬ 
dentally cracked off from larger rocks in that shape 
by sudden changes of temperature. It has also been 
claimed that human skeletons have been found in 
gold-bearing gravels in Miocene strata. But even if 
they were found in gravels belonging to that period, 
we have no right to conclude that they were buried 
in that period. Gravels can easily be disturbed, or 
the men may have fallen into a pit dug by some of the 
aborigines in these layers. There is, in fact, no proof 
of Miocene man that is satisfactory to scientists gener- 
ally. 
What is the next evidence ? In Denmark have 
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