gives the general appearance of the surface of the flow, looking up...
Detailed Description
This photo gives the general appearance of the surface of the flow, looking upslope, where the flow is narrower on slightly steeper terrain. It is normal for trees within the flow path to not burn after they topple. By the time the trees fall over, the surface crust of the flow has cooled below their ignition temperature. The photo was taken about 350 m (380 yards) behind the tip of the flow. The flow was already inflated 2 to 3 meters (yards) at this location.