Monday, December 1, 2014

Geo 730: December 1, Day 700: Lava->Lahar

A closer view of the same outcrop as yesterday's shot, showing lahar deposits over grey volcanic rock- likely something in the andesite/dacite range. Given the clean contact- as opposed to a brecciated lava surface, I'm guessing the top of the lava was an erosional surface for a period of time before the lahar deposits were emplaced. Again, the line of alders is a result of water following that contact until it reaches the cut.

Photo unmodified. October 10, 2012. FlashEarth Location (possibly maybe).

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