Figure 1. Area map showing all field trip stops on a topographic shaded-relief map overlain by geology from plate 3 of Christiansen (2001). The Yellowstone Caldera is outlined in green; resurgent domes are outlined with dashed black lines (Sour Creek Dome to northeast and Mallard Lake Dome to southwest); Henrys Fork Caldera is outlined in blue; Huckleberry Ridge Caldera is outlined in purple; West Thumb Caldera is outlined in red. Inset map is a gray-shaded topographic relief map of Yellowstone National Park and vicinity that highlights (red asterisks) places we will visit or pass on the field trip. On Day 1 of field trip, arrive and spend the night in Bozeman (see northwest corner of inset). Field trip stop numbers are provided on the map in black. The main road is shown by the heavy white line. Note that the first day in Bozeman has no field stops, and therefore is designated as just “Day 1” on the inset map.
Figure 2. Map showing the track of the Yellowstone hot spot over the past 17 million years from the McDermitt Volcanic Field to the Yellowstone Plateau Volcanic Field. The red and tan colors indicate higher altitudes and blues indicate lower altitudes (see scale). The Yellowstone crescent of high terrain is outlined by light blue lines (dashed along the crest). Active faults are shown in black with the heaviest lines indicating more active Holocene and major late Pleistocene faults on major mountain fronts and thinner black lines indicating lesser Pleistocene and Tertiary faults. The dotted white lines indicate the boundaries of four belts of faulting (I, II, III, and IV). Areas of calderas and volcanic fields and corresponding ages are shown as black dashed lines (queried where uncertain).
Boundaries of crustal 87 Sr/ 86 Sr ratios (0.706 and 0.704) are shown as dashed red lines. East of the 0.706 Sr-ratio line is Precambrian sialic crust, and west of the 0.704 Sr-ratio line is accreted oceanic terrain. Figure modified from Pierce and Morgan (1992) with parts of the figure reproduced as is from Pierce and Morgan (1992). Crustal 87 Sr / 86 Sr ratio boundaries added from Kistler and others (1981) and Kistler and Lee (1989). Abbreviations: Ma, mega-annum (million years before present); Sr, strontium.
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