The Bruneau-Jarbidge volcanic field, also known as the Bruneau-Jarbidge eruptive center, is located in present-day southwest Idaho. The volcano erupted during the Miocene, between ten and twelve million years ago, spreading a thick blanket of ash in the Bruneau-Jarbidge event. Animals were suffocated and burned in pyroclastic flows within a hundred miles of the event, and died of slow suffocation and starvation much farther away, notably at Ashfall Fossil Beds, located 1,000 miles downwind in northeastern Nebraska, where up to two meters of ash was deposited. At the time, the field was above the Yellowstone hotspot.