. Bulletin - United States National Museum. Science. THE BACKGROUND 11 the arctic coast east of the Mackenzie (Flint, 1947). So in western arctic America the glacial regime appears to have left large areas in the Yukon-Porcupine Valleys and on the arctic slope of Alaska free from ice fields during the late Wisconsin age. The conditions northwest of the American ice cap were quite different from those on the massive ice sheets which continuously covered the rest of Alaska, Canada, and some northern States. The records of glacial geology lead Flint (1947) to propose that Bering and Arctic seas w
. Bulletin - United States National Museum. Science. THE BACKGROUND 11 the arctic coast east of the Mackenzie (Flint, 1947). So in western arctic America the glacial regime appears to have left large areas in the Yukon-Porcupine Valleys and on the arctic slope of Alaska free from ice fields during the late Wisconsin age. The conditions northwest of the American ice cap were quite different from those on the massive ice sheets which continuously covered the rest of Alaska, Canada, and some northern States. The records of glacial geology lead Flint (1947) to propose that Bering and Arctic seas were frozen during the last great Wisconsin glaciation, and that the precipitation forming the arctic ice caps came from the tracks of storms like those of the present. This moisture would then have originated in the temperate oceans. However, re- cently acquired oceanographic evidence of the history of temperatures in the Atlantic Ocean has led Ewing and Donn (1956) to a novel. SEA-LEVEL ISOTHERMS : MAY (»C) A. J. Connor, and others, "Climatic Maps of North America," Cambridge, Harvard maps 1 and 3.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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