<p>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.</p>

Roadside Geology of Oregon (Roadside Geology Series)

Science & Math

David D. Alt

Donald W. Hyndman

Earth Sciences

Mountain Pr

<p>Written with the non-geologist traveler in mind, this book describes the geology of Montana. It follows the highways descrbing the geologic features found along the most-traveled, major roadways. From the mystery of Glacial Lake Missoula to the mountains of Glacier National Park to the oil fields of Eastern Montana, curious travelers will learn about the geology of the Treasure State.</p>

Roadside Geology of Montana (Roadside Geology Series)

Mountain Press

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Books by David D. Alt