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View of Snake River Plain north from Red Hill Pocatello Big Southern Butte is a composite rhyolite dome in left center of view In distance is the Lost River Range The Snake River plain is covered with Pleistocene basalt and sediment of the Snake River system The ranges to the north are basin and range mountains Pocatello is also in the Basin and Range province The Snake River Plain cuts across the Basin and Range Map from Pierce and Morgan 1992 showing high topography various zones of seismicity Sites of calderas or volcanic fields Topography is illustrated by color Map of the Eastern and western Snake River Plain showing sites of volcanic fields 17 Ma Columbia River basalt map Note subdued topography of eastern Idaho and western location of the Continental Divide Image courtesy of the U S Forest Service Department of Agriculture 17 Ma cross section across the western Snake River Plain Columbia River Basalt Image courtesy of the U S Forest Service Department of Agriculture View of Owyhee Mountains with Glenns Ferry Formation in the foreground of western Snake River Plain Bruneau River canyon Pleistocene basalts lie above 15 Ma Jarbidge rhyolite western Snake River Plain 10 Ma map showing the Twin Falls and Picabo volcanic fields Image courtesy of the U S Forest Service Department of Agriculture 10 Ma cross section across central Snake River Plain showing intrusion of hot spot volcanism Image courtesy of the U S Forest Service Department of Agriculture View of Rock Creek Canyon south of Twin Falls Rocks are tilted rhyolite ignimbrites of the Twin Falls volcanic field Rock Creek in the Cassia Mountains Rhyolites of Twin Falls volcanic field Shoshone Falls rhyolites of late stage of Twin Falls volcanic fields Gooding City of Rocks Rocks are 10 Ma rhyolites of the Twin Falls volcanic field Pliocene map with Heise volcanic field Image courtesy of the U S Forest Service Department of Agriculture 4 Ma Pliocene cross section Image courtesy of the U S Forest Service



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