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  • Dozens of iron concretions are found on a bluff in the Grand staircase Escalante in southern Utah. These iron concretions formed naturally between 6 and 25 million years ago as water dissolved the iron pigment in the red sandstone in the area. The pigment flowed down through the now bleached sandstone and then solidified when it came in contact with oxygenated water, forming a new iron mineral called hematite between the grains of sandstone. Over time, the sandstone eroded away, leaving the more durable iron concretions behind. These largely spherical balls are composed of a hard outer layer of hematite covering a ball of pink sandstone. By volume, the sandstone makes up the majority of these iron concretions, though those found elsewhere in the Colorado Plateau may contain much more hematite. Scientists aren't sure why they form in spheres or if they need something in particular as a nucleus to start growing.
    IronConcretions_HarrisWashUtah_4183.jpg
  • Iron concretions are found on a bluff in the Grand staircase Escalante in southern Utah. These iron concretions formed naturally between 6 and 25 million years ago as water dissolved the iron pigment in the red sandstone in the area. The pigment flowed down through the now bleached sandstone and then solidified when it came in contact with oxygenated water, forming a new iron mineral called hematite between the grains of sandstone. Over time, the sandstone eroded away, leaving the more durable iron concretions behind. These largely spherical balls are composed of a hard outer layer of hematite covering a ball of pink sandstone. By volume, the sandstone makes up the majority of these iron concretions, though those found elsewhere in the Colorado Plateau may contain much more hematite. Scientists aren't sure why they form in spheres or if they need something in particular as a nucleus to start growing.
    IronConcretions_HarrisWashUtah_4193.jpg
  • Dozens of iron concretions are trapped in cracks in the Grand staircase Escalante in southern Utah. These iron concretions formed naturally between 6 and 25 million years ago as water dissolved the iron pigment in the red sandstone in the area. The pigment flowed down through the now bleached sandstone and then solidified when it came in contact with oxygenated water, forming a new iron mineral called hematite between the grains of sandstone. Over time, the sandstone eroded away, leaving the more durable iron concretions behind. These largely spherical balls are composed of a hard outer layer of hematite covering a ball of pink sandstone. By volume, the sandstone makes up the majority of these iron concretions, though those found elsewhere in the Colorado Plateau may contain much more hematite. Scientists aren't sure why they form in spheres or if they need something in particular as a nucleus to start growing.
    IronConcretions_HarrisWashUtah_4202.jpg
  • Dozens of iron concretions are trapped in a sandstone pothole in the Grand Staircase Escalante in southern Utah. These iron concretions formed naturally between 6 and 25 million years ago as water dissolved the iron pigment in the red sandstone in the area. The pigment flowed down through the now bleached sandstone and then solidified when it came in contact with oxygenated water, forming a new iron mineral called hematite between the grains of sandstone. Over time, the sandstone eroded away, leaving the more durable iron concretions behind. These largely spherical balls are composed of a hard outer layer of hematite covering a ball of pink sandstone. By volume, the sandstone makes up the majority of these iron concretions, though those found elsewhere in the Colorado Plateau may contain much more hematite. Scientists aren't sure why they form in spheres or if they need something in particular as a nucleus to start growing.
    IronConcretions_Pothole_HarrisWashUt...jpg
  • A small sandstone window frames a view of a narrow slot canyon in the Coyote Wash area of Grand Staircase National Monument in Utah. Flash floods carved narrow canyons in the sandstone.
    Grand-Staircase-Escalante_Coyote-Gul...jpg
  • A small sandstone window frames a view of a narrow slot canyon in the Coyote Wash area of Grand Staircase National Monument in Utah. Flash floods carved narrow canyons in the sandstone.
    Grand-Staircase-Escalante_Coyote-Gul...jpg
  • A layered sandstone wall appears to have been twisted and folded by many thousands of years of geological forces in Harris Wash in Grand Staircase-Escalante National Monument, Utah.
    Grand-Staircase-Escalante_Harris-Was...jpg
  • A slot canyon makes a sharp curve in Coyote Gulch, located in the Grand Staircase-Escalante National Monument in Utah. The narrow sandstone canyon was carved by flash floods.
    Grand-Staircase-Escalante_Coyote-Gul...jpg
  • Flash floods eroded a wavy pattern into the narrow walls of this slot canyon in the Coyote Gulch of the Grand Staircase-Escalante National Monument in Utah.
    Grand-Staircase-Escalante_Wall-Curve...jpg
  • The weathered remains of a pinyon pine tree appear to hold up cumulus clouds that pass over the Grand Staircase-Escalante National Monument in Utah.
    Grand-Staircase-Escalante_Weathered-...jpg
  • Flash floods eroded a wavy pattern into the narrow walls of this slot canyon in the Coyote Gulch of the Grand Staircase-Escalante National Monument in Utah.
    Grand-Staircase-Escalante_Wall-Curve...jpg
  • Several small rocks lie at the base of a dry waterfall, which was carved by flash floods in the Coyote Gulch area of the Grand Staircase Escalante, Utah.
    CoyoteGulchDryFall.jpg
  • Water stands in Zebra Slot, a narrow slot canyon located in the Harris Wash in the Grand Staircase Escalante, Utah. The slot canyon was carved by the tremendous force from flash floods.
    Utah_ZebraSlot_4210.jpg
  • Dozens of iron concretions are trapped in a small crack in the Grand staircase Escalante in southern Utah. These iron concretions formed naturally between 6 and 25 million years ago as water dissolved the iron pigment in the red sandstone in the area. The pigment flowed down through the now bleached sandstone and then solidified when it came in contact with oxygenated water, forming a new iron mineral called hematite between the grains of sandstone. Over time, the sandstone eroded away, leaving the more durable iron concretions behind. These largely spherical balls are composed of a hard outer layer of hematite covering a ball of pink sandstone. By volume, the sandstone makes up the majority of these iron concretions, though those found elsewhere in the Colorado Plateau may contain much more hematite. Scientists aren't sure why they form in spheres or if they need something in particular as a nucleus to start growing.
    IronConcretions_HarrisWashUtah_4194.jpg
  • Several arches have been worn into a narrow slot canyon known as Peek-a-Boo Gulch, located in the Grand Staircase Escalante in Southern Utah.
    PeekABoo-Arches.jpg
  • Flash floods eroded a wavy pattern into the narrow walls of this slot canyon in the Coyote Gulch of the Grand Staircase Escalante, Utah.
    CoyoteGulchWavyWalls.jpg
  • The midday sun shines through a narrow opening at the top of a slot canyon in the Coyote Gulch area of the Grand Staircase Escalante in Utah.
    CoyoteGulchSunburst.jpg
  • A very narrow slot canyon winds like a corkscrew through Coyote Gulch, located in the Grand Staircase Escalante, Utah.
    CoyoteGulchCorkscrew.jpg
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