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  • 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
  • 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
  • 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
  • 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
  • Five North American Beavers (Castor canadensis) rest on top of their lodge in North Creek, Bothell, Washington. Beavers, the largest rodent in North America, live in lodges that are designed to protect them from predators. The mud that holds the sticks together freezes like concrete, making the structure virtually impenetrable. During large winter floods, however, the beavers occasionally have to evacuate the lodge and rest on its roof until the flood waters recede.
    Beavers_Lodge_FiveOnTop_NorthCreek_8...jpg
  • Two layers of water vapor — cirrus clouds and the streaks of a fog bank — frame the flank of Sauk Mountain in Washington state. The mountain is located near the town of Concrete in Skagit County, just west of the crest of the North Cascade Range.
    WA_Sauk-Mountain_Cirrus_Fog-Streaks_...jpg
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