• Two

    John Day Fossil Beds

    National Monument Oregon

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  • Thomas Condon Paleontology Museum Hours Reduced

    Starting Monday, September 22, the Thomas Condon Paleontology Museum begins fall season hours 10am-5pm daily. More »


Chris Schierup

Sheep Rock and the John Day River

NPS photo, Chris Schierup

Welcome to the Cenozoic, the Age of Mammals...

“No region in the world shows a more complete sequence of Tertiary land populations, both plant and animal than the John Day Basin.” - Dr. Ralph W. Chaney

Preserved within the assemblages of the John Day Basin is a fossil record that spans over 40 million years. If each time period recorded here is a page in a book, the National Monument holds an entire chapter of Earth’s history which tells the story of changing life and landscapes.

Please use the following links to explore each of the fossil bearing assemblages of the John Day Basin and imagine how much life has changed in the past 50 million years.


Did You Know?

Image of a cedar hairstreak butterfly

The wildflowers at the Painted Hills provide abundant sources of food for the monument's many butterfly species.