Low-angle sunlight shows the texture of the colorful Painted Hills in the John Day National Monument in Oregon. The layers represent different ash and pumice deposits from the Cascades and area volcanoes. The deposits were laid down approximately 33 million years ago. The red comes from rusty iron minerals; golden layers are rich with oxidized magnesium and iron, metamorphic claystone; the black comes from manganese.
Add to Cart Add to Lightbox Download