Human Origins

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The course of evolution seems to be that types and species, like individuals, have their periods of birth, growth, maturity, decay, and death. Thus fish of the ganoid type appear sparingly in the SHurian, culminate in the Devonian, and gra:dually die out in the later formations. So also Saurian reptiles appear' in the " Carboniferous, culminate in the Lias, and die out with the Secondary, or so nearly so that the crocodUia are their sole remaining representatives.
And this applies when we attem
...pt to take our first step backwards in tracing the origin of man, and follow him from the Quaternary into the Pliocene. When did the Pliocene end and the Quaternary begin ? Within which of the two did the first great glacial period fall ?
Does pre-glacial mean Pliocene, or is it included in the Quaternary 1 and to which do the oldest human remains belong, such as the skeletons of Spy ?
The difficulty of answering these questions is in- creased because, as we go back in time, the human remains which guide us in the Quaternary age necessarily become scarcer.


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