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Section: Photos
| Preview | Name | Overall | Comments |
|---|---|---|---|
 | Grand View |  | |
 | Grand Maps |  | The Grand Canyon of the Yellowstone The canyon varies from 800 to 1200 feet in depth and about 1500 to 4000 feet in width. Its length is about 24 miles. The upper 2 1/2 miles is the most colorful section. Hot spring activity has continues through the ages altering the lava rock to produce lovely colors which are largely due to varied iron compounds. Have you noticed that stream vents and geysers are still at work on the canyon walls? |
 | Grand View of the Falls | | |
 | Waterfall Informational Sign | | Waterfall Makers Here the Yellowstone River plunges 308 feet over the Lower Falls. Hot springs have weakened the rock just downstream, where you might see several geysers spouting into the river. As falling water pounds the thermally softened rock, it continues to undercut the falls and deepen the gorge. In this geologically active landscape, the park's riverbeds drop abruptly in more than a hundred locations. A half-mile upstream, the Upper Falls formed at a junction of a lava flow and glacial lake sediments - one dense and hard, the other brittle and easily eroded. [Lower image caption] A waterfall is a clue that you are standing at a geologic crossroads. [Caption for upper right image] A small geyser vent beside the Yellowstone River. |
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