Geology of John Day Fossil Beds National Park Service U.S. Department of the Interior John Day Fossil Beds National Monument

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Date: 2013-06-02 18:11:01 Tephra Petrology Igneous rocks John Day Formation John Day Fossil Beds National Monument Yellowstone hotspot Tuff Ochoco Mountains Pyroclastic rock Geology Volcanic rocks Volcanology		Geology of John Day Fossil Beds National Park Service U.S. Department of the Interior John Day Fossil Beds National Monument Add to Reading List Source URL: www.nps.gov Download Document from Source Website File Size: 1,26 MB Share Document on Facebook

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