Ground Truth Trekking

Sand dikes and sills

Muddy sand forced its way up through this peaty soil. For sand to flow upward like this requires liquefaction, where silty or sandy sediment becomes a flowing slurry.  Minor liquefaction is pretty common, but it takes a fairly extreme case to force the liquefied sediment up through peat layers like this.  This usually only happens during earthquakes, though landsliding, construction activities, or even trampling by animals could conceivably have this effect.

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By Bretwood HigmanAndrew MattoxGround Truth Trekking

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