Missoula Ice Age Floods

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Glacial Lake Missoula, mapped

About 15,000 years ago, an ice dam across the Clark Fork in northern Idaho impounded a 2,000-square-mile lake that periodically broke loose and rewrote the Pacific Northwest. Missoula Ice Age Floods lets you watch that lake fill, drain, and reshape the landscape — directly on the map, at the elevations the geologic record actually supports. WHAT YOU CAN DO • Slide through eleven reconstructed lake stands, from a low 850 m drainage threshold up to the 1,265 m maximum stand. Watch the shoreline trace real contours across western Montana and northern Idaho — the polygons are computed from USGS 1…

Kategoriler: Education, Reference

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