Lichen-covered Sioux Quartzite metamorphic rocks, South Dakota, USA.
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Lichen-covered Sioux Quartzite metamorphic rocks, South Dakota, USA.

Filename: 444013.jpg
Photographer: Richard Thom
Source: Visuals Unlimited, Inc.
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Credit: Richard Thom/Visuals Unlimited, Inc.
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Model Release: No
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