Media Collection: Columbia Basalt Group
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![John Day Fossil Beds, basalt bluffs, 1937]()
John Day Fossil Beds, basalt bluffs, 1937.
John Day Fossil Beds, basalt bluffs, 1937 Courtesy Oreg. Hist. Soc. Research Lib., OrHi830535
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Map of Columbia River Basalt Group.
Courtesy U.S. Geological Survey -
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Mascall Formation.
Courtesy National Park Service -
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Rattlesnake Formation, John Day.
Courtesy National Park Service
