Holly Crossland

Holly Crossland

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Holly Crossland
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TILTED ROCK LAYERS:  The sedimentary layers in this large roadcut near Denver, CO. can be clearly recognized by the variation in color. This deformation is related to the uplift of the Rocky Mountains

Tilted Rock Layers: sedimentary layers in this large roadcut near Denver, CO can be clearly recognized by the variation in color. This deformation is related to the uplift of the Rocky Mtns

Uinkaret volcanic field (NASA photo) on the No.Rim of the Grand Canyon (lava flows are brown). Lava flows from this volcanic field have dammed the Colorado River multiple times from 725,000 to 100,000 yrs ago. One of these cascades is today's 'Lava Falls.' Lava Falls Rapid, below Lava Falls on the Colorado River, is 'at all water levels, the most severe rapid in Grand Canyon.'

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