Capulin last eruption is approximately 60,000 years ago. It is also long extinct. The Capulin volcano did not or rarely have any human deaths.
The slopes of volcano have been partially stabilized by the breakdown of the volcanic material by lichens and mosses.
Soils formed grass, wildflowers, shrubs, and trees took roots.
The cinders are glassy and contains gas bubbles frozen into the place as the magma explodes and is thrown into the air and is cooled quickly. It's basically made up of ash, NOT LAVA.