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Half of a two-map set, the "Shaping of a Continent: North America's Active West" map features detail of the one of the most active tectonic areas in the world. Published in August 1985, this map accompanied the "Earth's Dynamic Crust" map and the article "Our Restless Planet Earth." The 1985 Shaping of a Continent: North Americas Active West map features:
• A cross-section of the region in the present day
• Notes about terranes, the Juan de Fuca plate, marine transgressions, batholiths, basin and range, the Columbia River plateau, the Snake River plain, and the Laramide Orogeny
• Four inset maps showing the formation of the west coast region over the last 90 million years
• An inset map illustrating 90 million years of continental drift
Coverage Area: Oregon, Idaho, Wyoming, northern California, northern Nevada, northern Utah, northern Colorado, southern Washington, southern Montana
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