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Unsorted debris: everything from sand to large slabs of rock.

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Yellow: Material displaced by flash flood in one large section (about 15′ across)  It’s not solid, but a wedge of coarse sand and loose rock that had been located up the arroyo.

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Several flash flood events (4-5) left alluvial fan deposits in the river.

 

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Naked Geology / Erosion

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