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Arches National Park Geology Tour provides an extensive, visually rich description of the geology of Arches, by Deborah Ragland, Ph.D. See our DVD collection.
This is an image of Umbriel.
Click on image for full size
NASA

Umbriel

Umbriel was discovered by W. Lassell in 1851. It has a standoff distance of 265,970 km. Umbriel is about as wide as the Oregon coast line, being 1170 km (780 miles) in size.

The surface features of this moon are very hard to distinguish in this image, but suggest that Umbriel may be one of the icy moons.

Last modified November 19, 2000 by Jennifer Bergman.

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