BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY
Aerial photograph of badlands in the John Day Fossil Beds National Monument, Oregon, USA. This area has been covered in layers of ash and dust from successive volcanic eruptions spanning 44 to 7 million years ago. The rapid deposition of the ash killed and preserved the animals and plants, forming layers of fossil beds.
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