The first unmistakable relic of man in Europe is a human lower jaw found in the Mauer sands near Heidelberg, some seventy-nine feet below the surface of the bluff.[20] It seems to belong to the second or Mindel-Riss interglacial epoch, and its age is estimated by Osborn at about 250,000 years. Remains characteristic of the oldest Paleolithic epochs occur between thirty and forty-five feet below the surface. If we are to find an archæological name for this epoch, there seems to be no better one than Eolithic, the dawn of the Stone Age, when European man had hardly more than begun to chip a stone implement, although we must recognize the unreadiness of many or most archæologists to find a place for such rude products.[21] The third interglacial period (Riss-Wurm) and the fourth period of advance (Wurm) cover what is known as Lower Paleolithic time, which is the earlier four-fifths or more of the Old Stone Age or Paleolithic period, extending approximately from 125,000 B. C., to 25,000 B. C. During the greater part of this period Europe was occupied by the Neanderthaloid people. Neanderthal man had a very large head with heavy, overhanging eyebrows meeting above the nose, and a markedly retreating forehead. The face was high and the large nasal opening indicates a broad, flat nose. The lower jaw was heavy and the chin retreating. The trunk was short, thick, and robust, the shoulders broad; the limbs short and heavy, the arms and lower legs relatively short, and the hands very large. Although the much-discussed Piltdown skull may quite probably be regarded as belonging to the earliest part of this period, the finer form of cranium seems to testify to a higher race of better mental development than the Neanderthaloids, huddling in their caves and shelters. It may easily represent a far more progressive ancestral race, of which they are somewhat degenerate descendants, though Osborn dissents from this view.[22] Their remains are found in caves and rock-shelters all over Europe. Here we find their hearths; the bones of the animals which they had hunted for their food; their almond-shaped flint axes, "hand-stones" (_Coups-de-Poing_), the scrapers for dressing skins and shaving wooden tools, and a variety of other forms. Here they buried their dead. During the third warm interglacial epoch they lived in the open, as at the station of Chelles, which has given its name to the earliest Paleolithic epoch.[23] Their origin and route of migration is quite uncertain, but it seems probable that they entered Europe from the southern shore of the Mediterranean.