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  • A black-tailed prairie dog (Cynomys ludovicianus) feeds on grass in the Rocky Mountain Arsenal National Wildlife Refuge near Denver, Colorado. Black-tailed prairie dogs are native to North American grasslands although their populations are well below historical levels. Rocky Mountain Arsenal National Wildlife Refuge was established in 1992 on the site of a former U.S. Army chemical weapons manufacturing facility.
    Prairie-Dog_Black-Tailed_Rocky-Mount...jpg
  • A mule deer (Odocoileus hemionus) rests in the grass in Rocky Mountain Arsenal National Wildlife Refuge in Colorado. Rocky Mountain Arsenal National Wildlife Refuge was established in 1992 on the site of a former U.S. Army chemical weapons manufacturing facility.
    Deer-Mule_Grass_Rocky-Mountain-Arsen...jpg
  • A mule deer (Odocoileus hemionus) rests in the grass in Rocky Mountain Arsenal National Wildlife Refuge in Colorado. Rocky Mountain Arsenal National Wildlife Refuge was established in 1992 on the site of a former U.S. Army chemical weapons manufacturing facility.
    Deer-Mule_Grass_Rocky-Mountain-Arsen...jpg
  • Two black-tailed prairie dogs (Cynomys ludovicianus) meet at the entrance to a burrow in the Rocky Mountain Arsenal National Wildlife Refuge near Denver, Colorado. Black-tailed prairie dogs are native to North American grasslands although their populations are well below historical levels. Rocky Mountain Arsenal National Wildlife Refuge was established in 1992 on the site of a former U.S. Army chemical weapons manufacturing facility.
    Prairie-Dogs_Black-Tailed_Rocky-Moun...jpg
  • A mule deer (Odocoileus hemionus) rests in the grass in Rocky Mountain Arsenal National Wildlife Refuge in Colorado. Rocky Mountain Arsenal National Wildlife Refuge was established in 1992 on the site of a former U.S. Army chemical weapons manufacturing facility.
    Deer-Mule_Grass_Rocky-Mountain-Arsen...jpg
  • The Three Graces reach high into the sky in the Garden of the Gods in Colorado Springs, Colorado. The Three Graces are just one of many dramatic sandstone features of the park. According to geologists, the sedimentary rock was tilted by the forces that built nearby Pikes Peak and other mountains.
    CO_GardenGods_ThreeGraces_2320.jpg
  • The Three Graces reach high into the sky in the Garden of the Gods in Colorado Springs, Colorado. The Three Graces are just one of many dramatic sandstone features of the park. According to geologists, the sedimentary rock was tilted by the forces that built nearby Pikes Peak and other mountains.
    CO_GardenGods_ThreeGraces_1255.jpg
  • The Gunnison River in Colorado flows into a narrow gorge lined by trees displaying their fall colors. The Gunnison River is the fifth largest tributary of the Colorado River.
    CO_GunnisonRiver_Autumn_1937.jpg
  • The Colorado River and several smaller rivers empty into the Gulf of California, also known as the Sea of Cortez, in northern Baja California, Mexico. This area is called the Colorado River Delta.
    ColoradoRiverDelta_9977.jpg
  • Pegmatite, a light-colored granite, forms bright stripes on the otherwise dark walls of the Black Canyon of the Gunnison in Colorado. These stripes were found on the Painted Wall, an especially dramatic part of the national park and the highest cliff in all of Colorado. Pegmatite is the result of especially water-rich magma, which is the last to cool and harden. Because it remains fluid longer, it is able to squeeze into cracks in rocks, resulting in the light-colored lines here.
    CO_PaintedWall_GunnisonNP_1965.jpg
  • Pegmatite, a light-colored granite, forms bright stripes on the otherwise dark walls of the Black Canyon of the Gunnison in Colorado. These stripes were found on the Painted Wall, an especially dramatic part of the national park and the highest cliff in all of Colorado. Pegmatite is the result of especially water-rich magma, which is the last to cool and harden. Because it remains fluid longer, it is able to squeeze into cracks in rocks, resulting in the light-colored lines here.
    CO_PaintedWall_GunnisonNP_1966.jpg
  • A very large and bright rainbow seems to land on the summit of Badito Cone, a 8942 foot (2726 meter) peak in Huerfano County, Colorado. Badito Cone is one of several peaks that were formed by jets of magma that erupted from holes or cracks in the rock of that area about 25 million years ago.
    CO_Rainbow_BaditoCone_2282.jpg
  • A raven (Corvus corax) flies over the Colorado River at the entrance to the Grand Canyon at Desert View, Grand Canyon National Park, Arizona.
    Grand-Canyon_Raven_Desert-View_6557.jpg
  • A red fox (Vulpes vulpes) rests in a field near Ohio Creek in the Gunnison National Forest in Colorado. Red foxes are typically found in remote, forested hilly areas near marshes and streams. The red fox has an especially wide range. It's native to most of United States and Canada, Europe, North Africa, and nearly all of Asia, including Japan.
    RedFox_Gunnison_2152.jpg
  • Hikers, visible at the bottom right corner of the image, provide a sense of scale for the Great Sand Dunes near Mosca, Colorado, the tallest sand dunes in North America. The tallest dunes in the park rise about 750 feet from the valley floor.
    GreatSandDunesHikers.jpg
  • The sand dunes of Great Sand Dunes National Park, Colorado, are the tallest in North America Some of the sand originated from the San Juan Mountains, more than 65 miles west of the national park. Strong winds blow the sand, which piles up at the base of the Sangre de Cristo Mountains.
    GreatSandDunes_Layers_2203.jpg
  • Golden aspens, at the peak of their fall color, stand at the base of the Sangre de Christo mountain range near Zapata, Colorado.
    AspensSangreDeChristoCO.jpg
  • The Earth's shadow and red cirrus clouds are visible over the Rocky Mountains in this view from the highest point of Trail Ridge Road in Rocky Mountain National Park, Colorado.
    CO_RockyMountainNP_SummitSunrise_120...jpg
  • The Maroon Bells are reflected in Maroon Lake in Colorado on a still autumn morning. The Maroon Bells are a pair of mountains, the tallest of which is 14,156 feet (4,317 meters). The peaks are located in the Maroon Bells-Snowmass Wilderness of White River National Forest.
    CO_MaroonBells_Autumn_Dawn_1750.jpg
  • Golden aspen trees at the peak of fall color stand at the base of Marcellina Mountain, a 11,353 foot (3461 meter) peak in Gunnison County, Colorado.
    CO_MarcellinaMountain_Autumn_1850.jpg
  • The sun rises over Tenderfoot Mountain, a 8625 foot (2629 meter) peak in Gunnison, Colorado. Two taller mountains in Gunnison County are visible on the horizon. At center is Quartz Dome, which is 11299 feet (3444 meters) tall. At right is Lookout Mountain, which is 11099 feet (3383 meters) tall.
    CO_TenderfootMountain_Sunrise_Gunnis...jpg
  • Hundreds of tall sand dunes form at the base of the Sangre de Cristo Mountains in Great Sand Dunes National Park, Colorado. Strong winds blow the sand from as much as 65 miles (105 km) away. These mountains block the wind's path, causing the sand to pile up in dunes.
    GreatSandDunes_Sunset_V_2268.jpg
  • Hundreds of tall sand dunes form at the base of the Sangre de Cristo Mountains in Great Sand Dunes National Park, Colorado. Strong winds blow the sand from as much as 65 miles (105 km) away. These mountains block the wind's path, causing the sand to pile up in dunes.
    GreatSandDunes_Sunset_H_2273.jpg
  • The sand dunes of Great Sand Dunes National Park, Colorado, are the tallest in North America Some of the sand originated from the San Juan Mountains, more than 65 miles west of the national park. Strong winds blow the sand, which piles up at the base of the Sangre de Cristo Mountains.
    GreatSandDunes_Layers_2224.jpg
  • Hundreds of tall sand dunes form at the base of the Sangre de Cristo Mountains in Great Sand Dunes National Park, Colorado. Strong winds blow the sand from as much as 65 miles (105 km) away. These mountains block the wind's path, causing the sand to pile up in dunes.
    GreatSandDunes_2215.jpg
  • Big game hunters have repeatedly used a "deer crossing" sign for target practice. This sign was found near Rifle, Colorado.
    DeerSignV.jpg
  • Several dramatic rock formations stand at the top of one of the hills in the Hartman Rocks Recreation Area near Gunnison, Colorado.
    CO_HartmanRocks_1900.jpg
  • Fall colors line the bluff at Tomichi Point, high above the Gunnison River in Black Canyon of the Gunnison National Park, Colorado. The gorge is the steepest in North America, dropping 2,772 feet (845 meters) at one point. It's called the Black Canyon because it's so steep in places that light doesn't reach the bottom.
    CO_Gunnison_TomichiPoint_1941.jpg
  • The fast-moving Gunnison River carves a deep gorge in the rock at Black Canyon of the Gunnison National Park in Colorado. Near this point, the Gunnison River drops 240 feet per mile (45 m/km), causing it to gain speed and strength to erode tougher rock. The Gunnison River drops more within the national park than the Mississippi River does between Minnesota and the Gulf of Mexico.
    CO_Gunnison_Exclamation_2054.jpg
  • Ruby Peak (left) and Mount Owen are reflected in Lake Irwin, located near Crested Butte, Colorado, at sunrise. Located in Gunnison County, Ruby Peak has an elevation of 12641 feet (3853 meters); Mount Owen is slightly taller with an elevation of 13058 feet (3980 meters). Lake Irwrin, also known as Lake Brennand, was formed in 1963 with the completion of the Lake Brennand Dam.
    CO_LakeIrwin_2076.jpg
  • A northern plateau lizard (Sceloporus undulates elongatus) blends in with the rocks along the rim of the Black Canyon of the Gunnison in Colorado. The northern plateau lizard, which lives in rock outcrops and canyon walls, feeds on grasshoppers, crickets, leaf hoppers, flying ants, moths and other insects.
    Lizard_NorthernPlateau_GunnisonNP_20...jpg
  • A red fox (Vulpes vulpes) hunts in a field in the Gunnison National Forest, Colorado.
    RedFox_Hunting_2160.jpg
  • Big game hunters have repeatedly used a "deer crossing" sign for target practice. This sign was found near Rifle, Colorado.
    DeerSignH.jpg
  • A colorful, stormy sunrise hovers over the alpine tundra at about 12,000-feet elevation in Rocky Mountain National Park, Colorado.
    CO_AlpineTundra_Sunrise_RockyMtn_122...jpg
  • The full moon rises over the Grand Canyon and Colorado River in this view from the Tuweep Overlook (also spelled Toroweap) in Grand Canyon National Park, Arizona.  The Tuweep Overlook, located on the north rim of the Grand Canyon, provides one of the most dramatic canyon views. Here, the canyon is 3,000 feet deep and one mile wide — one of the few places on the Grand Canyon rim where you can see both the Colorado River and the other side of the canyon.
    GrandCanyon_Tuweep_Full-Moon_4695.jpg
  • A raven (Corvus corax) flies over the Colorado River at the entrance to the Grand Canyon at Desert View, Grand Canyon National Park, Arizona.
    Grand-Canyon_Raven_Desert-View_6636.jpg
  • The Tuweep Overlook, also spelled Toroweap, provides one of the most dramatic views of the Grand Canyon in Arizona. Here, the canyon is 3,000 feet deep and one mile wide. It's one of the few places on the canyon rim where you can see both the Colorado River and all the way across the canyon.
    GrandCanyon_TuweepSunrise_4815_v.jpg
  • The Colorado River makes a dramatic, almost circular bend at Horseshoe Bend, south of Page, Arizona, in the Glen Canyon National Recreation Area. The towering red cliffs are about 1,000 feet (305 meters) above the river.
    AZ_Horsehoe-Bend_Stormy-Sunrise_0613.jpg
  • A dramatic fall sunrise lights up the sky over the Colorado River and the Grand Canyon in this view from Moran Point.
    GrandCanyon_MoranPoint_Sunrise_8697.jpg
  • The Tuweep Overlook, also spelled Toroweap, provides one of the most dramatic views of the Grand Canyon in Arizona. Here, the canyon is 3,000 feet deep and one mile wide. It's one of the few places on the canyon rim where you can see both the Colorado River and all the way across the canyon.
    GrandCanyon_TuweepSunrise_4807.jpg
  • Stars shine above the steep walls of the Tuweep Overlook, also spelled Toroweap, which provides one of the most dramatic views of teh Grand Canyon in Arizona. Lit by the full moon, the walls of the canyon are 3,000 feet tall. Here, the canyon is also a mile wide. It's one of the few places on the Grand Canyon rim where you can see both the Colorado River and the other side of the canyon.
    GrandCanyon_Tuweep_Night_4774.jpg
  • The Colorado River makes a dramatic, almost circular bend at Horseshoe Bend, south of Page, Arizona. The towering red cliffs are about 1,000 feet (305 meters) above the river.
    AZ_HorseshoeBend_8537.jpg
  • Great Sand Dunes National Park is home to the tallest sand dunes in North America. The tallest of the dunes climb 750 feet from the San Luis Valley. The valley is very windy and the sands are trapped by the Sangre de Christo Mountains, visible in the background.
    GreatSandDunes_SangreDeChristo_2244.jpg
  • Great Sand Dunes National Park is home to the tallest sand dunes in North America. The tallest of the dunes climb 750 feet from the San Luis Valley. The valley is very windy and the sands are trapped by the Sangre de Christo Mountains, visible in the background.
    GreatSandDunesMountainsCO.jpg
  • Great Sand Dunes National Park is home to the tallest sand dunes in North America. The tallest of the dunes climb 750 feet from the San Luis Valley. The valley is very windy and the sands are trapped by the Sangre de Christo Mountains, not visible in this frame.
    GreatSandDunesCO.jpg
  • Low clouds form over Zion Canyon in this aerial view over Zion National Park in southern Utah. The Virgin River is seen winding through Zion Canyon in the middle of this image.
    ZionNP_Zion-Canyon_Aerial_7942.jpg
  • Panning the camera during a long exposure produces this impressionistic view of aspen trees at the peak of their fall color in the Colorado mountains.
    Aspens_FallColor_MaroonBells_Abstrac...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
  • Brittlebush (Encelia farinosa) grows in a dry valley on the eastern side of Lassen Volcanic National Park, California. The wildflower typically blooms from March until May and is common in the Mojave and Colorado deserts as well as dry interior valleys in California.
    Brittlebush_Lassen_5815.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 rainbow stretches across the sky above the Vermilion Cliffs near Page, Arizona. The Vermilion Cliffs, which rise as much as 3,000 feet (914 meters), are the second step in the five-step Grand Staircase of the Colorado Plateau, which stretches from northern Arizona to southern Utah.  The cliffs are made up of sedimentary rocks, primarily sandstone, siltstone, limestone, and shale, that have eroded over millions of years. The Vermilion Cliffs were designated as the Vermilion Cliffs National Monument in 2000.
    AZ_VermilionCliffs_Rainbow_8507.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
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