Mass wasting
What is this mass wasting landform (N 48.284272° W 121.850112°)? I suggest that you view this landform in Google Earth looking towards the northwest and zoom into an eye altitude of about 0.5 km (500 meters. This mass wasting event is complex so focus on the top part of the mass wasting. The question is about the top part – specifically at N 48.284272° W 121.850112°
a.stuzstrom
b.rotational slump
c.debris flow
d.debris avalanche