![America's national monuments : the geologic West. [Volume 1], Fossil treasures of the Pacific Northwest: John Day Fossil Beds National Monument](https://illumira-media.s3.amazonaws.com/njcore_21375/tn/njcore_21375-9d1725ad73aee0bdeee61f41b0cf9bcae364dc72-medium.jpg)
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America's national monuments : the geologic West. [Volume 1], Fossil treasures of the Pacific Northwest: John Day Fossil Beds National Monument
The John Day Fossil Beds National Monument encompasses 10,000 square miles spanning 40 million years of ancient life.