The huge La Garita Volcanic Caldera, which blasted over 1000 cubic miles of material into the air about 26 MYA (Mt. St. Helens blasted a mere .6 cubic miles in 1980), has more calderas inside - something like Russian nested dolls: one inside another, inside another. The Bachelor Caldera is mid-sized caldera inside the La Garita Caldera. And the Creede caldera fits inside of that one. Hwy 149 crosses the edge of the Creede Caldera at this point, Wagon Wheel Gap.