CHAPTER IV.
BIOLOGICAL AND PHYSICAL CHANGES IN NORTH-WESTERN EUROPE BEFORE THE ARRIVAL OF MAN.—THE PLEIOCENE PERIOD.
We have seen in the two preceding chapters that man had no place in the Eocene and Meiocene faunas, because they present no traces of other living mammalian species. In this chapter we shall see that one living species, if not more, does occur in the Pleiocene strata of France and Italy, and that therefore the improbability of man having lived in Europe at that time is proportionally lessened. It is, however, very unlikely that he will ever be found in the Pleiocene strata of this country, because they are either purely marine, or consist of freshwater accumulations, which have been worked over and, for the most part, destroyed by the action of the waves on the beach during the depression of the land beneath the sea.