![]() ![]() Geophysical, Sedimentological, and Photographic Data from the John Day Reservoir, Washington and Oregon: Data Archive and Preliminary Discussion USGS Open-File 2004-1014
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Figure 11. Click in figure for larger image. Maps showing (A) the distribution of exposures of Miocene and Quaternary material under the John Day Reservoir, and (B) the distribution of fluvial deposits in the reservoir. Miocene volcanic rocks are limited to the western half of the reservoir, while Quaternary strata underlie the eastern part of the reservoir. |