Geology - Grand Canyon National Park (U.S. National Park Service)
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Beginning about 630,000 years ago, lava cascaded over the canyon's North Rim from volcanoes such as Vulcan's Throne, damming the river at least 13 times. One ...
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The oldest rocks in the Grand Canyon, found at the bottom of the canyon, are primarily metamorphic, with igneous intrusions (the name given to when magma or ...
Most of the canyon's igneous and metamorphic rocks make up the bottom layers of Grand Canyon, near the Colorado River. Igneous rocks formed when liquid magma ...
The geology of the Grand Canyon area includes one of the most complete and studied sequences of rock on Earth. The nearly 40 major sedimentary rock layers ...