Figure 12.28

Yellowstone hot spot. (A) Some 16 million years ago, the oldest of the extinct volcanoes on the Yellowstone hot spot track, McDermitt Caldera, was located over the hot spot. The southwestern direction of plate movement has transported McDermitt Caldera, and the other now-extinct volcanoes produced by the Yellowstone hot spot, to the southwest. The ages of the calderas are given in millions of years (Ma). Yellowstone’s hot springs and geysers, such as the Grand Prismatic Spring (B) and Old Faithful (C), are the active result of the active magma body that resides beneath the park.