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Welcome to Yellowstone National Park, a nearly 9,000 km2 (~3,468 mi2) area preserved in 1872 as the world’s first national park for its unique, extraordinary, and magnificent natural features. Rimmed by a crescent of older mountainous terrain, Yellowstone National Park has at its core the Quaternary Yellowstone Plateau, an undulating landscape shaped by forces of late Cenozoic explosive and effusive volcanism, on-going tectonism, glaciation, and hydrothermal activity. The Yellowstone Caldera is the centerpiece of the Yellowstone Plateau. The Yellowstone Plateau lies at the most northeastern front of the 17-Ma Yellowstone hot spot track, one of the few places on Earth where time-transgressive processes on continental crust can be observed in the volcanic and tectonic (faulting and uplift) record at the rate and direction predicted by plate motion. The 2.2-Ma-to-present Yellowstone Plateau Volcanic Field (YPVF) contains three large nested calderas. The Yellowstone Caldera erupted >1,000 km3 of pyroclastic material and is the last major caldera-forming event, occurring at 0.63 Ma. The YPVF now is host to the world’s largest concentration of hydrothermal features (>10,000 hot springs, geysers, hydrothermal explosion craters, mud pots, and fumaroles). Prior to the cataclysmic eruption of its caldera-forming Lava Creek Tuff of the Yellowstone Group, emplacement of both rhyolitic and basaltic lava flows occurred around what is now recognized as the topographic and structural margin of the caldera. Two significant periods of postcaldera volcanism have contributed to filling in the collapsed caldera; volcanism last occurred on the Yellowstone Plateau around 70,000 years ago. Hydrothermal activity is assumed to have been present prior to and immediately after major caldera events. Today, hydrothermal activity is concentrated within the Yellowstone Caldera and along zones of tectonic weakness. Travertine deposits at Mammoth Hot Springs date at least as far back as 375,000 years. Over six days, this field trip presents an intensive overview into volcanism, tectonism, and hydrothermal activity on the Yellowstone Plateau (fig. 1). Field stops are linked directly to conceptual models related to monitoring of the various volcanic, geochemical, hydrothermal, and tectonic aspects of the greater Yellowstone system. Recent interest in young and possible future Geologic Field-Trip Guide to the Volcanic and Hydrothermal Landscape of the Yellowstone Plateau By Lisa A. Morgan1, W.C. Pat Shanks1, Jacob B. Lowenstern1, Jamie M. Farrell2, and Joel E. Robinson1 volcanism at Yellowstone as well as new discoveries and synthesis of previous studies, (for example, tomographic, deformation, gas, aeromagnetic, bathymetric, and seismic surveys), provide a framework in which to discuss volcanic, hydrothermal, and seismic activity in this dynamic region. The Yellowstone Hot Spot and Snake River Plain

Geologic field-trip guide to the volcanic and hydrothermal landscape of the Yellowstone Plateau