Now this is where the real geology begins. The middle line is the conglomerate or where the fault runs. The top and bottom is tuff from the caldera explosions. The green is just a form of lichen.
As parasite cones developed within the caldera and began to issue forth ash,
deposition occurred over some one thousand square miles. Remnants of these
eruptions remain visible today. Picket Post Mountain, west of Superior, is a classic
example of deposition remnant.