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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Madison Range (1)
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North America
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Rio Grande Rift (1)
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Rocky Mountains
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U. S. Rocky Mountains
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Sangre de Cristo Mountains (1)
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San Luis Valley (2)
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United States
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Alaska
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Alaska Range (1)
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Colorado
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Alamosa County Colorado (1)
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Saguache County Colorado (1)
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Montana
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Gallatin County Montana
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Hebgen Lake (1)
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U. S. Rocky Mountains
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Sangre de Cristo Mountains (1)
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elements, isotopes
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isotopes
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radioactive isotopes
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Al-26 (1)
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Be-10 (1)
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metals
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alkaline earth metals
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beryllium
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Be-10 (1)
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aluminum
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Al-26 (1)
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geochronology methods
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uranium disequilibrium (1)
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geologic age
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Cenozoic
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Quaternary
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Pleistocene
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lower Pleistocene (1)
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Primary terms
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absolute age (2)
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Cenozoic
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Quaternary
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Pleistocene
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lower Pleistocene (1)
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earthquakes (1)
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faults (2)
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geochronology (1)
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geomorphology (2)
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geophysical methods (1)
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isotopes
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radioactive isotopes
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Al-26 (1)
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Be-10 (1)
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metals
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alkaline earth metals
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beryllium
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Be-10 (1)
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aluminum
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Al-26 (1)
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North America
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Rio Grande Rift (1)
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Rocky Mountains
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U. S. Rocky Mountains
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Sangre de Cristo Mountains (1)
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paleoclimatology (1)
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sediments
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clastic sediments
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cobbles (1)
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tectonics
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neotectonics (1)
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United States
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Alaska
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Alaska Range (1)
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Colorado
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Alamosa County Colorado (1)
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Saguache County Colorado (1)
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Montana
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Gallatin County Montana
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Hebgen Lake (1)
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U. S. Rocky Mountains
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Sangre de Cristo Mountains (1)
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sediments
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sediments
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clastic sediments
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cobbles (1)
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Early Pleistocene climate-induced erosion of the Alaska Range formed the Nenana Gravel
Establishing chronologies for alluvial-fan sequences with analysis of high-resolution topographic data: San Luis Valley, Colorado, USA
Geophysical expression of buried range-front embayment structure: Great Sand Dunes National Park, Rio Grande rift, Colorado
Abstract The catastrophic Hebgen Lake earthquake of 18 August 1959 (M W 7.3) led many geoscientists to develop new methods to better understand active tectonics in extensional tectonic regimes that address seismic hazards. The Madison Range fault system and adjacent Hebgen Lake–Red Canyon fault system provide an intermountain-active tectonic analog for regional analyses of extensional crustal deformation. The Madison Range fault system comprises fault zones (~100 km in length) that have multiple salients and embayments marked by preexisting structures exposed in the footwall. Quaternary tectonic activity rates differ along the length of the fault system, with less displacement to the north. Within the Hebgen Lake basin, the 1959 earthquake is the latest slip event in the Hebgen Lake–Red Canyon fault system and southern Madison Range fault system. Geomorphic and paleoseismic investigations indicate previous faulting events on both fault systems. Surficial geologic mapping and historic seismicity support a coseismic structural linkage between the Madison Range and Hebgen Lake–Red Canyon fault systems. On this trip, we will look at Quaternary surface ruptures that characterize prehistoric earthquake magnitudes. The one-day field trip begins and ends in Bozeman, and includes an overview of the active tectonics within the Madison Valley and Hebgen Lake basin, southwestern Montana. We will also review geologic evidence, which includes new geologic maps and geomorphic analyses that demonstrate preexisting structural controls on surface rupture patterns along the Madison Range and Hebgen Lake–Red Canyon fault systems.