Glacial Lake Missoula and Its Humongous Floods

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  Roadside Geology of Oregon

  Until about 200 million years ago, the western margin of North America lay to the east, along the present Idaho border, and a broad coastal plain spread westward into Oregon. The rest of the state was ocean floor. Then the continent began moving slowly westward away from Europe and the floor of the Pacific Ocean began sliding beneath the western edge. That is what created Oregon, and this book tells how it happened.

  GB-33010001

  $12.00
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  Roadside Geology of Washington

  The geology of Washington is a story of islands-- micro-continents-- coming in from the sea. Two hundred million years ago most of Washington consisted of two large islands, each one a scrap of continent, lying somewhere in the vastness of the Pacific Ocean. One after the other they docked onto the North American continent, each adding its distinctive bit to the complex geologic and geographic mosaic of western North America.

  GB-42010001

  $13.50

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