Welcome to John Day Fossil Beds National Monument. For almost 150 years, paleontologists and geologists have been visiting the John Day Basin to study the area’s abundant fossils and surrounding geology. In 1975 the fossil beds became a National Monument to preserve a world class record of plant and animal evolution, changing climate, and past ecosystems that span over 40 million years. The three units of the park display a multitude of fantastic geologic features that are sure to stun visitors from all over the world. If you would like to get to know the three units better before you visit, please click the links below to learn more.