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A roadside view of Oregon and Washington geology
Assembling the Northwest:
Marli B. Miller Dept. of Earth Sciences University of Oregon
Central Oregon Geoscience Society
Note: Due to file size limitations on the COGS website, this slide set has been reduced in length and some images have been compressed.
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Beach'4'
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sandstone*
shale*
limestone*
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Sawtooth Peak, elev 9179
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Driving'east'on'I.84'
Driving'east'on'WA.14'
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Area*>*77,000*square*miles*Volume*>*52,000*cubic*miles**17?6*Ma,*94%*by*14.5*Ma*
Followed"path"of"the""Ancestral"Columbia"River"
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Multnomah*Falls*Drops'620'feet'in'two'falls'over'flows'of'Grande'Ronde'Basalt'of'the'Columbia'River'Basalt'Group'
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Early"Columbia"River"Gravels"
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Wanupum'Basalt'Wanupum*Basalt*
16'–'15.6'Ma'Grande*Ronde*Basalt*
15.6'–'15'Ma'
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Eagle'Creek'Fm'
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Maximum*flood*crest*nearly*100’*above*Vista*House*
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