Sheep Rock Unit, John Day Fossil Beds National Monument

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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:68868024
  • Views:17
  • Downloads:1

Keywords for Facebook, Twitter and LinkedIn timeline photos

ancient ash clay colorful green history layers minerals origin species tertiary volcanic weathering

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