Neogene-Quaternary Tectonics and Volcanism of Southern Jackson Hole, Wyoming and Southeastern Idaho
Lageson and others -- Neogene-Quaternary Tectonics and Volcanism 115 Neogene-Quaternary Tectonics and Volcanism of Southern Jackson Hole, Wyoming and Southeastern Idaho David R. Lageson Department of Earth Sciences, Montana State University, Bozeman, MT 59717 David C. Adams Department of Earth Sciences, Montana State University, Bozeman, MT 59717 Lisa Morgan U.S. Geological Survey, Box 25046, MS-966, Federal Center, Denver, CO 80225 Kenneth L. Pierce U.S. Geological Survey, Box 25046, MS-980, Federal Center, Denver, CO 80225 Robert B. Smith Department of Geology and Geophysics, 717 W.C. Browning Building, University of Utah, Salt Lake City, UT 84112 INTRODUCTION This field trip guide focuses on the region south of the Snake volcanic rocks of the Snake River Plain Yellowstone region River Plain between Pocatello, Idaho and Jackson, Wyoming (Fig. (Adams, 1997). The second aspect involves a reinterpretation of 1). Our intent is not to rewrite the excellent geologic field guides large slide blocks found primarily within the Grand-Swan Valley that have already been published (e.g., Love and Reed, 1971; of southeast Idaho. We (Morgan and Lageson) suggest an alter- Love and Love, 1983; Love and Love, 1988; Love, 1989; Smith native hypothesis to the slow creep model of emplacement and Downs, 1989; Smith et al., 1990; Pierce and Good, 1992; (Boyer and Hossack, 1992), namely that some slide blocks may Good and Pierce, 1996), but rather to synthesize regional tec- have been emplaced catastrophically during large magnitude earth- tonic relations and present new information relative to the mag- quakes associated with large-volume silicic eruptions in the Heise matic and structural history of the region.
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