In a Slump

Trains meet near Keenbrook in Cajon Pass.

I grew up the son of a Soil Scientist. Spotting old landslides and slumpages is just second nature to me. You can hardly travel anywhere in Southern California and not see evidence of landslides. The whole grassy slope just above the units used to be located about 100  feet up, and to the left, and there is another slide above that. What goes up (uplift,) must come down (erosion and gravity.)