The volcano has a central edifice 350 km wide and 1.5 km high with a double caldera complex at the summit.

Mount Pleasant lies along the southwestern margin of the caldera complex.

Yellowstone National Park is on three partly covered caldera complexes.

It is north of at least one more caldera complex with a resurgent dome.

No historical records are found from the caldera complex.

The caldera complex is surrounded by granitic rocks containing pendants.

At least five volcanic fields centered on large caldera complexes have been identified.

The caldera complex lies in the Wabigoon greenstone belt.

The caldera complex has inferred to be a subaqueous lava lake during the early stages of the caldera's development.

The youngest unit, also early Amazonian, covers the summit plateau, dome, and caldera complex.