By James A. Larsen

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Ann. Univ. Turku. 3, 7-47. Irving, W. N. (1968). The barren grounds. In "Science, History, and Hudson Bay" (C. S. Beals and A. ), pp. 26-54. Dept. Energy, Mines, and Resources, Ottawa, Canada. Irving, W. , and Harington, C. R. (1973). Upper Pleistocene radiocarbon-dated artefacts from the northern Yukon. Science 179, 335-340. Ives, J. D. (1974). Biological réfugia and the Nunatak hypothesis. In "Arctic and Alpine Environments" (J. D. Ives and R. G. ), pp. 605-636. Methuen, London. Ives, J. D. (1978).

Geological time scale. Science 133, 1105-1114. Larsen, J. A. (1965). : Studies in subarctic and arctic bioclimatology. Ecol. Monogr. 35, 37-59. Larsen, J. A. (1967). , central Canada. Univ. Wisconsin Dep. Meteor. Tech. Rep. 32, Madison, Wisconsin. Larsen, J. A. (1971a). Vegetational relationships with air mass frequencies: Boreal forest and tundra. Arctic 24, 177-194. Larsen, J. A. (1971b). The vegetation of Fort Reliance, Northwest Territories. Can. Field. Nat. 85, 147-178. Larsen, J. A. (1973).

With conditions even warmer than today, a major readjustment of relationships among species even in unglaciated areas must have occurred. As the ice retreated, species characteristic of the boreal forest moved northward in its wake. When the glacial ice disintegrated, species that had retreated south before advancing ice in the central and eastern portions of the North American continent now formed an unusual mosaic of representatives of both the boreal and deciduous forests. Far to the west, species that had found refuge in the mountains also now marched northward.

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