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- W104116833 abstract "Since the earliest geological investigations in Idaho, researchers have speculated on the existence of a large lake in the western Snake River plain. O.C. Marsh, writing in King's 1878 report on the geological exploration of the 40th parallel, suggested, based on fish paleontology, the presence of a large lake covering parts of southern Idaho and Oregon. Recent investigators of sediments and fossils have debated the size of the lake, even suggesting a series of small lakes in a broad river valley. Their mapping of basalt units in the northern Bruneau River canyon suggests that a large, permanent lake indeed existed, and that toward the end of its evolution during the Pliocene may have had a highstand elevation of 3600-3800 ft. Lake margin features are preserved by the individual basalt units that were changed in character as they flowed into the lake. This change from solid basalt to basalt rubble and boulders enclosed within a dark disaggregated matrix is present in successively younger units that flowed northwestward from volcanoes to the south. Stratigraphic evidence of successively younger flows, emplaced at continually higher elevations, suggests that the lake gradually filled and that the lakeshore transgressed southward. The regressive facies of the lakemore » is preserved in the gravel sequences that are present at the mouths of present-day river canyons, whose ancestral drainages debouched into the slowly draining lake. From the undeformed lake-margin features present throughout the region, Lake Idaho apparently occupied the western Snake River plain depression, and was connected to a series of lakes in eastern Oregon. The configuration of these lakes strongly suggests that this lake system, prior to capture by the Snake River through Hells Canyon, may have drained through the present Grand Ronde River system.« less" @default.
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- W104116833 date "1987-08-01" @default.
- W104116833 modified "2023-09-23" @default.
- W104116833 title "Lake Idaho: new perspectives through basalt stratigraphy" @default.
- W104116833 hasPublicationYear "1987" @default.
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