DINOSAUR - Yellowstone Supervolcano: An Apocalyptic Prehistoric Survival Thriller (Paperback) (ISBN-13: 9798185102152)

A ticking time bomb beneath America's most famous national park has just detonated.

When a historic swarm of earthquakes tears open the caldera, it releases more than just superheated steam. From the deep, uncharted caverns beneath the park, an ancient, subterranean ecosystem is forced to the surface-and its apex predators are starving.

Now, Ranger Mercer must lead a group of stranded civilians through an ash-choked nightmare. With the ground fracturing beneath their feet and an eruption threatening to blow, escaping the blast radius is only half the battle.

Surviving the deadliest bipedal carnivores the Earth has ever known is the other.

Welcome to the bottom of the food chain.