In the first cold moist period the full wave of arctic tundra life appeared in the whole region between the Alpine and Scandinavian glaciers during the renewed descent of the ice-fields; this was the tundra stage of early Magdalenian times, accompanying the _Bühl_ advance. At the stations of Thaingen, Schweizersbild, Kastlhäng, and Niedernau, appears the musk-ox, together with the woolly mammoth, the woolly rhinoceros, and the reindeer. The discovery of the grotto of Kastlhäng, a reindeer hunting station in the Altmühltale of Bavaria(6) fills out what has long been a gap in the geographic distribution of the early Magdalenian. The principal objects of the chase here were the reindeer, the wild horse, the arctic hare, and the ptarmigan; the royal stag is very rare, and the bison is wanting entirely; a strong arctic character is given to the fauna by the presence of the banded lemming, the arctic wolverene, and the arctic fox. From this region the musk-ox migrated far to the southwest, reaching the northern slopes of the Pyrenees. At the same time the arctic grouse, the whistling swan, and other northern birds entered the region of the Rhine and the Danube. But the surest indicators of a cold tundra climate prevailing during the period of the _Bühl_ advance are the banded lemming (_Myodes torquatus_) and the Obi lemming (_Myodes obensis_), which are found in the same deposits with the arctic hare, the reindeer, and the woolly mammoth mixed with the implements of the early Magdalenian industry at the stations of Sirgenstein, Wildscheuer, and Ofnet along the upper and middle Danube. There also appear the ermine and the arctic wolverene; in fact, almost all the characteristic forms of tundra life except the polar bear, which only enters the northern tundras in the summer season. [Illustration: FIG. 185. Characteristic forms of alpine life, which descended from the mountains or migrated from the highlands of western Asia in Aurignacian and Magdalenian times: the ibex, the chamois, the alpine ptarmigan, the argali sheep, and the (_A_) alpine vole, all shown one-twenty-fifth life size; and the (_A_) alpine vole also one-fifth life size.]