The type station of the Chellean culture is somewhat east of the present town of Chelles. Here in Chellean times the broad floods of the ancient River Marne were transporting great quantities of sand and débris, products of the early pluvial periods of Third Interglacial times; and here, on the right bank, embedded in sands and gravels 24 feet thick, are found the typical Chellean implements mingled with remains of the hippopotamus, straight-tusked elephant, Merck's rhinoceros, giant beaver, hyæna, and many members of the Asiatic forest and meadow fauna. The flint-working stations at St. Acheul were on bluffs from 40 to 80 feet above the present level of the Somme. The Chellean and the following Acheulean industry was carried on here on a very extensive scale. In one year Rigollot collected as many as 800 coups de poing from the ancient quarries; near by are other quarries equally rich in material, and we may imagine that the products of the flint industry in this favorable locality were carried far and wide into other parts of the country. In the vicinity of Paris, and again at Arcy, in the valley of the Bièvre, the workers of Chellean, Acheulean, and Mousterian flints sought in succession the old river-gravels belonging to the lower levels; these 'low terraces' are only 15 feet above the present height of the river and are still occasionally flooded by the high waters of the Seine, indicating that the Seine borders have not altered their levels. The animal life here was identical with that of the Somme and of the Thames and included the hippopotamus, Merck's rhinoceros, and the straight-tusked elephant. Thus it would appear that, in regard to the river courses and the hills through which they flowed, the topography and landscape of northern France and of southern Britain were everywhere the same as at the present time. The forests which clothed the hills were not greatly different from the present, except for the presence of a few trees of a warmer clime, nor was there anything strange or unfamiliar in the majority of the animals that roamed through forest and meadow. The three chief archaic elements consisted in the presence of two very ancient races of men and their rude stage of culture, in the great forms of Asiatic and African life which mingled with the more familiar native types, and in the broad, continuous land surfaces which swept off unbroken to the west and southwest.