— the basin painted in blue-green ash.
“One of three units of John Day Fossil Beds National Monument, on the John Day River north of US-26. The pale tower of Sheep Rock rises above the Thomas Condon Paleontology Center; a few miles up the road, Blue Basin holds an amphitheatre of blue-green volcanic ash. Forty million years of mammals are read out of these hills.
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The Sheep Rock Unit lies in north-central Oregon along the John Day River, where State Highway 19 meets US-26 near Dayville. The named formation, a layered tower of pale volcanic ash and basalt, gives the unit its name. The Thomas Condon Paleontology Center sits at its foot and holds active fossil collections. The unit is one of three in John Day Fossil Beds National Monument, established in 1975 to protect roughly forty million years of fossil-bearing sediments laid down across the Cenozoic.
Blue Basin is an amphitheatre of pale blue-green claystone three miles north of the visitor center. The colour comes from celadonite, a mineral formed in the welded volcanic ash of the Turtle Cove member of the John Day Formation, around twenty-eight million years old. A one-mile loop drops into the basin floor; a longer overlook trail climbs the rim. The colour shifts through the day, holding its strongest green-blue under flat overcast light rather than under direct sun.
The Thomas Condon Paleontology Center is open Wednesday through Sunday with free admission; the monument grounds and trails are open every day from dawn to dusk. There are no entrance fees, no campgrounds inside the unit, and no services beyond the visitor center. The nearest gas and food are in Dayville, eight miles south, and Mitchell, thirty-five miles west. Summer temperatures routinely exceed ninety-five Fahrenheit and there is no shade on the open trails.