. Brigham Young University science bulletin. Biology -- Periodicals. Biological Series, Vol. 14, No. 2 Reconnaissance of Nohthern Yukon. Fig. 6. Old Crow Flats, along Timber Creek showing angular lakes with about the same directional development as the ridge at left. Arrow marks collecting site 67. Air Photo Division—Energy, Mines, and Resources— Canadian Covernment air photo A a bottomless bog area during summer, and for much of the year, it is a barrier to overland movement. Se\eral low "islands" rise above the general marshv level of the flats (Fig. 6). These are bedroc
. Brigham Young University science bulletin. Biology -- Periodicals. Biological Series, Vol. 14, No. 2 Reconnaissance of Nohthern Yukon. Fig. 6. Old Crow Flats, along Timber Creek showing angular lakes with about the same directional development as the ridge at left. Arrow marks collecting site 67. Air Photo Division—Energy, Mines, and Resources— Canadian Covernment air photo A a bottomless bog area during summer, and for much of the year, it is a barrier to overland movement. Se\eral low "islands" rise above the general marshv level of the flats (Fig. 6). These are bedrock exposures of either Lisburne Limestone, Kayak Shale or of the yoimger lower sandstones of the Cretaceous sequence. These rocks are folded and appear to be overlain unconformably by the much younger lake silts and clays of the flats. The islands rise as much as 400 to 500 feet above the general level of the flats. Minor ice- shoved gravel beaches produce limited dry- ground ridges 5 to 15 feet high along the shores of some lakes. Lakes of the flats occur generally below the 1000-foot contour, where the flats have a slope of only a few feet per mile. These lakes range from angular rectangular to rounded and many show a distinct lineation with a northwest- southeast trend and an even more pronounced northeast-southwest one. Such rectangular out- line is particularly shown well in the south- eastern and northwestern quarters of the flats, but is also evident in the northeastern part. The northwest-southeast trend is parallel to fold. 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 Brigham Young University. Provo, Utah : Brigham Young University
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