- Stock Photography: SHEEP ROCK UNIT, JOHN DAY FOSSIL BEDS NATIONAL MONUMENT by Emiddelkoop
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- Photo title: Sheep Rock Unit, John Day Fossil Beds National Monument
- Author: Emiddelkoop
- Cover photo description:
- The John Day Basin is a fossil record that spans over 40 million years. The predominant exposures of green rock seen on Sheep Rock are a multitude of reworked layers of volcanic ash. The rich green color of the claystone was caused by chemical weathering of a mineral called celadonite. This happened millions of years ago as water moved through the alkaline ash beds under high pressure.
- Image ID:68868063
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