Hyperconcentrated flow

Circumstances

A variety of lahar, which is formed by the water suspended flows of volcaniclastics. Volcanic sediments rapidly deposited from the water-saturated flow having 40 - 80 % of sediments concentration. Intermediate between volcanic debris flow and stream flow.

Sedimentary facies (Sediments)

Includes isolated boulders which is extraordinary larger than sediments in the matrix.

Sedimentary facies (Structures)

Unclear parallel stratificaition, High angle cross statification, No erosional surface.