Tuesday, June 3, 2008
The Grand Mesa is a large geologic formation in western Colorado in the United States. The largest mesa in the world, it has an area of about 500 square miles (1300 km²) and stretches for about 40 miles (65 km) east of Grand Junction between the Colorado River and the Gunnison River, its tributary to the south. Geologically the mesa is the result of a hard volcanic basalt layer on its top. This volcanic layer, created during the birth of the modern Rocky Mountains approximately 30 million years ago, suppressed erosion compared to the surrounding sedimentary rock layers, which suffered rapid downcutting from the Colorado and the Gunnison.
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