The Greaser Petroglyph Site in southeastern Oregon preserves a rare and very old record of human activity in the Warner Valley near Greaser Canyon. Native Americans scraped the carvings into a basalt boulder, perhaps 12,000 years ago, in a region where people have lived for at least 15,000 years. Although the Northern Paiute lived around Greaser Canyon when Euro-American travelers arrived in 1840, the images may have been made by much earlier people. Their meaning remains unknown despite many interpretations. Protected for its archaeological and cultural significance, the site was added to the National Register of Historic Places on November 20, 1974, and later repaired after vandalism.