Islands & Rapids: A Geologic Story of Hells Canyon
In this book, the first written on the geology of Hells Canyon, a world-class scientist tells the story of the deepest gorge on the North American continent. Born as islands in the Pacific Ocean, the rocks in Hells Canyon moved slowly northward with the North American continent after it broke loose from the Pangea supercontinent. Finally, the islands collided with the North American continent and were zippered to it. Bathed again by the sea, deeply eroded, and subsequently covered beneath a mile of lava flows, the entire area was lifted by, and along, large faults. In addition to telling the geologic history of the canyon, the book includes a mile-by-mile guide to the major features of Hells Canyon. A glossary and an annotated bibliography also complement the author's narrative along with his personal reminiscences and more than 100 photographs, many in full color.
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A Geologic Story of Hells Canyon
Geologic Time and Regional Geology
Geology of Hells Canyon
6 other sections not shown
alluvial fan Big Bar Blue Mountains Island boat Bonneville Flood boulders breccia canyon walls Columbia River Basalt conﬂuence Coon Hollow Formation Cougar Creek Complex Creek Rapids crop crystallized Dave debris deposited dikes Doyle Creek Formation eroded erupted feet ﬁrst ﬂood ﬂoor foliation formed fossils gabbro Geologic map Hells Canyon Dam Hells Canyon region hike Hunsaker Creek Formation Idaho Idaho side igneous rocks Imnaha island arc Jurassic landslide Late Triassic lava ﬂows ldaho magma Martin Bridge Limestone Mazama Ash metamorphic million minerals Mountains Island Arc mouth mylonite nver occur ocean outcrops Oxbow Complex Oxbow Dam Permian plutonic rocks pre-Cenozoic pyroclastic quartz diorite radiometric rhyolite River Basalt Group River Canyon rocks in Hells Ronde River Rush Creek Salmon River sandstone sediments segment Seven Devils Mountains Sheep Creek Formation siltstone Snake River stream tectonic thrust fault trail trondhjemite unconformity volcanic breccia Wallowa Mountains Wallowa Terrane Wild Sheep Creek