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  • The Painted Hills in John Day National Monument, Oregon are comprised of several layers of ash and pumice deposits from the Cascades and area volcanoes. The deposits were laid down approximately 33 million years ago. Eventually the layers were thrust upward and tilted by movement of the Earth's plates. The red comes from rusty iron minerals; golden layers are rich with oxidized magnesium and iron, metamorphic claystone; the black comes from manganese.
    OR_PaintedHills_Palette_3240.jpg
  • This panorama shows the colorful layers that give the Painted Hills in the John Day National Monument in Oregon their name. 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.
    OR_PaintedHills_Panorama_3098.jpg
  • A cross-section of petrified wood displays a wide spectrum of colors in the Rainbow Forest of Petrified Forest National Park in Arizona. The petrified wood in the park is made up of almost solid quartz and the colors are the result of impurities in the quartz, such as iron, carbon and manganese. It formed more than 200 million years ago when logs washed into an ancient river system. The logs were quickly buried by sediment, which slowed decay. Over time, minerals, including silica, were absorbed into the porous wood, replacing the original organic material over hundreds of thousands of years.
    AZ_Petrified-Forest_Petrified-Wood_D...jpg
  • The Painted Hills in John Day National Monument, Oregon are comprised of several layers of ash and pumice deposits from the Cascades and area volcanoes. The deposits were laid down approximately 33 million years ago. Eventually the layers were thrust upward and tilted by movement of the Earth's plates. The red comes from rusty iron minerals; golden layers are rich with oxidized magnesium and iron, metamorphic claystone; the black comes from manganese.
    OR_PaintedHills_WideView_3192.jpg
  • A close-up of a a cross-section of petrified wood reveals colors in abstract patterns in the Petrified Forest National Park in Arizona. The petrified wood in the park is made up of almost solid quartz and the colors are the result of impurities in the quartz, such as iron, carbon and manganese. It formed more than 200 million years ago when logs washed into an ancient river system. The logs were quickly buried by sediment, which slowed decay. Over time, minerals, including silica, were absorbed into the porous wood, replacing the original organic material over hundreds of thousands of years.
    AZ_Petrified-Forest_Petrified-Wood_A...jpg
  • The Painted Hills in John Day National Monument, Oregon are comprised of several layers of 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.
    OR_PaintedHills_CloseUp_3185.jpg
  • The Painted Hills in John Day National Monument, Oregon are comprised of several layers of 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.
    OR_PaintedHills_CloseUp_3145.jpg
  • 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.
    OR_PaintedHills_DeepShadow_3175.jpg
  • Colorful layers of siltstone, mudstone and shale are visible in the badlands near the Blue Mesa in Petrified Forest National Park, Arizona. The layers contain iron and manganese, which provide the pigments for the brilliant and varied colors.
    AZ_Petrified-Forest_Badlands_Painted...jpg
  • A variety of petroglyphs, including symbols depicting a hunter chasing a deer, are visible on a rock wall at Newspaper Rock State Historic Monument in San Juan County, Utah. The oldest symbols on the rock were made about 2,000 years ago by Archaic, Anasazi, Fremont, Navajo, Anglo and Pueblo people. The oldest petroglyphs on the sandstone appear to be fading, re-covered by desert varnish, a natural manganese-rich coating. In Navajo, the rock is called Tse' Hone, which means a rock that tells a story.
    Petroglyphs_Newspaper-Rock_Utah_0977.jpg
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