Tuesday, November 18, 2014

Geo 730: November 13, Day 682: Source of the Bridge

Looking across the Columbia River at Cascade Locks, the peak on the right, the same as in yesterday's shot, appears to be sedimentary rock. The peak on the left looks like Columbia River Basalt. Given the essentially horizontal bedding in both exposures, it seems pretty certain there's a significant fault between the two, close to the left peak. In closing, note that the pair of cliffs seems to create an amphitheater-like wall, curving around to the south (we're looking close to west, in this view) on the far left.

Photo unmodified. October 10, 2012. FlashEarth Location.

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