. Bulletin - United States National Museum. Science. Arctic Loon (ravia arctica pacifica (see pp. 31, 158). 4. Old Crow nn HE GAP IN OUR INFORMATION about the geographical distribution of â *â life in the northern interior of Yukon Territory has been especially significant because there we could expect to find a transition from the specialized fauna of Alaska to the more generalized American fauna of the Mackenzie Valley, representing the central part of the American continent. The Terrain The Porcupine River extends the Alaskan Yukon Valley eastward across Yukon Territory to within 50 miles o
. Bulletin - United States National Museum. Science. Arctic Loon (ravia arctica pacifica (see pp. 31, 158). 4. Old Crow nn HE GAP IN OUR INFORMATION about the geographical distribution of â *â life in the northern interior of Yukon Territory has been especially significant because there we could expect to find a transition from the specialized fauna of Alaska to the more generalized American fauna of the Mackenzie Valley, representing the central part of the American continent. The Terrain The Porcupine River extends the Alaskan Yukon Valley eastward across Yukon Territory to within 50 miles of the Mackenzie River and the arctic coast of Canada (see maps, figs. 1 and 7). Passes through the British and Richardson Mountains from Old Crow River Valley to the arctic coast are numerous and shorter and lower than the passes through the Alaskan part of the Brooks Range. Macdougall Pass through the Richardson Mountains, leading from the eastern tributaries of the Porcupine to the Mackenzie watershed, is shorter and, with an elevation of 1,200 feet, lower than any pass through the 149. 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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