It is believed that about 640,000 years ago (during the Pleistocene epoch), a massive volcano erupted, creating a caldera in the center of what is now Yellowstone National Park.
Over millions of years, sediment typically accumulates to great depths, from one-half mile to nearly 2 miles, and in rare cases, 3 miles deep.
The findings dramatically alter the climatic framework used by geologists reconstructing past climate change; archaeologists describing human responses to environmental change; and water managers tasked with balancing environmental, agricultural and urban water needs in drought-stressed southwestern North America.
The “rototilling” effect most happens wherever salmon are found in high densities, such as British Columbia, Alaska and some individual streams in the Pacific Northwest.
At an elevation of over 12,000 feet, this alpine terrain is exceptional, especially the glades of Lower Enchanted Forest, rated a double-black diamond.