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Filters: Tags: McGrath district, Kuskokwim region, Alaska (X)

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Album caption: Oblique aerial view of the Takotna River valley and the bordering uplands. The flood plain of the meandering Takotna River (Qam) floors of the broad canyon cut through the uplands along the Nixon Fork fault. On the left side of the river, Takotna Mountain rises about 3.500 feet above sea level. It has a core of mafic and felsic igneous rocks of Tertiary age and is mantled with rubble. To the right of the river are rounded mountains and creek valleys underlain by folded sedimentary rocks - graywacke and shale - of Cretaceous age. The summits form a prominent upland surface that has been intensely dissected by streams. McGrath district, Kuskokwim region, Alaska. 1942. (Photo by U.S. Army Air Force)...
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Album caption: Vertical aerial view of part of the younger dune field bordering the Kuskokwim River. Prominent dune ridges in the field (Qs) are outlined and numbered as follows: (1) single ridges, (2) composite ridges, and (3) groups of ridges. The dune field is bordered on the northeast by the flood plain (Qam) of the meandering Kuskokwim River, from which it is separated by a steep escarpment that averages 100 feet in height. Along this border there is also a low bedrock hill (a.) Center of the picture is located about 8 miles east-southeast of McGrath. McGrath district, Kuskokwim region, Alaska. 1942. (Photo by U.S. Army Air Force) Published as figure 30 in U.S. Geological Survey Bulletin 1071-G. 1960. No...
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Album caption: Oblique aerial view of the bog-covered alluvial plain of the Nixon Fork lowland and bordering fan apron. The bog-covered alluvial plain (Qapl) covers much of the upper half of the picture. The bogs (a) smooth light-gray areas, and islands (b) together give a ragged, mottled appearance to the picture. On the lower half is a fan apron (Qaa) that leads down from bordering uplands and merged into the alluvial plain. The flood plains (Qam) of the Nixon Fork and one of its tributaries are along the upper edge of the picture. McGrath district, Kuskokwim region, Alaska. 1949. (Photo by U.S. Air Force) Published as figure 34 in U.S. Geological Survey Bulletin 1071-G. 1960. No index card available.
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Album caption: Exposure through the end moraine of the Selatna glaciation along the Big River. Till (light-gray bands) is interbedded with outwash gravel (dark-gray bands), reflecting minor advances and retreats of the ice margin. Large boulder shown in picture has diameter of about 4 feet. This exposure is 6 miles southwest of Lone Mountain. McGrath district, Kuskokwim region, Alaska. circa 1949. Published as figure 24 in U.S. Geological Survey Bulletin 1071-G. 1960. No index card available.
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Album caption: Oblique aerial view of a large part of the older dune field between the Kuskokwim and Big Rivers. The field (Aso) is characterized by sand ridges and irregularly shaped sand hillocks, on which white spruce and black spruce are dominant (dark-gray areas.) Interdune areas have scattered black spruce and a heavy cover on muskeg vegetation (light-gray areas.) The dune field is bordered on the northeast (upper left corner of the picture) by the flood plain (Qam) of the meandering Katlitna River, from which it is separated by an irregular escarpment estimated to range between 100 and 150 feet in height. On the opposite side of the river is a small part of the younger McGrath dune field (Qs), separated from...
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Album caption: Moraines of the Selatna and Farewell glaciations along the Big River. The end moraine of the Farewell glaciation forms the high escarpment on the far right side of the Big River flood plain. The escarpment averages about 100 feet in height. The long smooth ridge beyond, and rising above - the end moraine is one the lateral moraines of the Selatna glaciation. These moraines are 4 miles north of the south border of the upper Kuskokwim region. McGrath district, Kuskokwim region, Alaska. circa 1949. Published as figure 25 in U.S. Geological Survey Bulletin 1071-G. 1960. No index card available.
    map background search result map search result map Oblique aerial view of the Takotna River valley. McGrath district, Kuskokwim region, Alaska. 1942. Exposure through the end moraine of the Selatna glaciation. McGrath district, Kuskokwim region, Alaska. circa 1949. Moraines of the Selatna and Farewell glaciations along the Big River. McGrath district, Kuskokwim region, Alaska. circa 1949. Oblique aerial view of a large part of the dune field between the Kuskokwim and Big Rivers. McGrath district, Kuskokwim region, Alaska. 1949. Vertical aerial view of part of the younger dune field bordering the Kuskokwim River. McGrath district, Kuskokwim region, Alaska. 1942. Oblique aerial view of the bog-covered alluvial plain of the Nixon Fork lowland. McGrath district, Kuskokwim region, Alaska. 1949. Oblique aerial view of the Takotna River valley. McGrath district, Kuskokwim region, Alaska. 1942. Exposure through the end moraine of the Selatna glaciation. McGrath district, Kuskokwim region, Alaska. circa 1949. Moraines of the Selatna and Farewell glaciations along the Big River. McGrath district, Kuskokwim region, Alaska. circa 1949. Oblique aerial view of a large part of the dune field between the Kuskokwim and Big Rivers. McGrath district, Kuskokwim region, Alaska. 1949. Vertical aerial view of part of the younger dune field bordering the Kuskokwim River. McGrath district, Kuskokwim region, Alaska. 1942. Oblique aerial view of the bog-covered alluvial plain of the Nixon Fork lowland. McGrath district, Kuskokwim region, Alaska. 1949.