Join geologist and field trip host, Tom Oesleby, for a fascinating geological tour of the northern loop of Yellowstone Park. The Greater Yellowstone Ecosystem is bigger than life-size in ways that thrill us all, ways that tell of an America that was--here is a landscape that supports pristine forests, lush meadows, majestic mountains and abundant wildlife. The geological story begins about 60 million years ago, a time characterized by great ice ages, immense volcanic erruptions, and violent collisions of the earth's crust. From out of these geological episodes, one of the true wonders of the world was created—Yellowstone.
