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Columbia River Basalt Map

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Columbia River Basalt Stratigraphy in the Pacific Northwest

The Columbia River Basalt Group CRBG consists of a thick sequence of Miocene flood basalt that covered northern Oregon eastern Washington and western Idaho between 17 and 6 million years ago It is an important regional aquifer system and in its folded and faulted flows it records the late Cenozoic structural evolution of much of the Pacific Northwest

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