By Roy M. Breckenridge, Brian F. Atwater, Victor R. Baker, Alan J. Busacca, Richard L. Chambers, Robert R. Curry, Larry G. Hanson, Eugene P. Kiver, Eric V. McDonald, Dale F. Stradling, Richard B. Waitt Jr.
About The Product
Published via the yank Geophysical Union as a part of the Field journey Guidebooks Series.
In 1933, the 16th consultation of the overseas Geological Congress integrated an day trip into the Channeled Scabland that was once ready by means of J Harlen Bretz of the college of Chicago. Professor Bretz's paintings at the Channeled Scabland coated over forty years. Now, we meet in 1989 at the related topic to determine the facts and vindication of his paintings, and to envision new examine in this vital occasion in Quaternary geology.
Chapter 1 advent (pages 1–2): Roy M. Breckenridge
Chapter 2 Glacial Lake Missoula: Sedimentary facts for a number of Drainages (pages 3–11): Richard L. Chambers and Robert R. Curry
Chapter three reduce Glacial Lakes Missoula and Clark Fork Ice Dams (pages 13–21): Roy M. Breckenridge
Chapter four The Spokane Valley and northern Columbia Plateau (pages 23–35): Eugene P. Kiver, Dale F. Stradling and Victor R. Baker
Chapter five Stratigraphic and Geomorphic proof for Dozens of Last?Glacial Floods (pages 37–50): Richard B. Waitt and Brian F. Atwater
Chapter 6 The Grand Coulee and Dry Falls (pages 51–55): Victor R. Baker
Chapter 7 The list of Pre?Late Wisconsin Floods and overdue Wisconsin Flood good points within the Cheney?Palouse Scabland (pages 57–62): Alan J. Busacca, Eric V. McDonald and Victor R. Baker
Chapter eight The Columbia Valley and Columbia River Gorge (pages 63–67): Larry G. Hanson and Victor R. Baker
Chapter nine References (pages 69–72):
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Extra resources for Glacial Lake Missoula and the Channeled Scabland Missoula, Montana to Portland, Oregon, July 20-26, 1989
The well-defined limit of glaciation in the valley is 52 Ian upvalley, well upriver of the limits of the two source bedrock belts. Thus these boulders must be the bedload deposit of a colossal flood. deposit of a great pre-Wisconsin flood down the Columbia, perhaps correlative with pre-Wisconsin flooding evidenced in eastern Channeled Scabland tracts (Chapter 7). Proceeding west on Grant Road toward the airfield, we ascend the backslope of probably the world's most colossal point bar. 5 m. Decorating this surface are loess-mantled giant current dunes.
Interpretation: upvalley toe of fan built out across Columbia River by at least four floods down Moses Coulee. T310: Rock Island bar, an upvalley part of the fan from Moses Coulee, comprises four gently upvalley-dipping beds of basaltic (Moses Coulee derived) gravel whose tops grade up from fine gravel through sand to silt. The normal grading and upward succession of sedimentary structures closely resemble those of a well-formed rhythmite in the lower Yakima or Walla Walla valley (see below). The graded bed atop the lowest gravel bed is capped by at least 37 graded silt-clay couplets identical to classic varves.
5 m and larger components. Maximum clast size here is 3 m. The diamicton is in turn overlain by flood-reworked fluvial gravels capping the terraces. At reduced reservoir levels and as seen on pre-reservoir air photos, low ridges composed of diamicton extend towards the valley center. Large boulders continue across the valley and produced the Spokane Rapids (Symons, 1882), prior to reservoir filling and the flooding of the Columbia River valley behind Grand Coulee Dam. ) flood followed by moraine building by the Columbia ice lobe at a time when a glacial lake was absent from this part of the valley.