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Landslide hummocks, Mt. St. Helens, Washington
Hikers and landslide hummocks in the crater of Mt. St. Helens, Washington (220813-45)
Download ImagePhantom Ship, Crater Lake caldera, Oregon (vertical)
Phantom Ship, 400ka andesite in the caldera of Mt. Mazama. Crater Lake National Park, Oregon. (221016-30)
Download ImageFjaðrárgljúfur Canyon, Iceland
Fjaðrá River and Fjaðrárgljúfur Canyon, Iceland, eroded into palagonite tuff (180907-18)
Download ImageFjaðrárgljúfur Canyon, Iceland (vertical)
Fjaðrá River and Fjaðrárgljúfur Canyon, Iceland, eroded into palagonite tuff (180907-16)
Download ImageAsh bed in Oligocene-Miocene rock, Nebraska
Ash bed in Oligocene-Miocene rock of the Arikaree Group, Scotts Bluff National Monument, Nebraska (220916-106) volcanic air fall, Tertiary
Download ImageAsh bed in Oligocene-Miocene rock, Nebraska
Volcanic ash bed in Oligocene-Miocene sandstone of the Arikaree Group, Scotts Bluff National Monument, Nebraska. (220916-76)
Download ImageConcretions and cross-bedded sandstone, Nebraska
Irregularly shaped concretions and cross-bedded sandstone of the Oligocene-Miocene Arikaree Group, Scotts Bluff, Nebraska (220916-33)
Download ImageFoliation in Ordovician gneiss, Delaware
Foliation in Ordovician Brandywine Blue Gneiss of the Wilmington Complex, Delaware (220909-9)
Download ImageBoudin of quartz-feldspar gneiss in granofels
Boudin of granitic gneiss in older Silurian-Devonian granofels, New Hampshire (220905-4)
Download ImageSeneca Rocks, West Virginia
Seneca Rocks, made of Silurian Tuscarora Sandstone, West Virginia (210908-11)
Download ImageCliffs of White River and overlying Arikaree Groups, NE
Cliffs of flat-lying Oligocene White River Group below Oligocene-Miocene Arikaree Group of Scotts Bluff National Monument, Nebraska (220916-118)
Download ImageEdge of Ash bed in Oligocene-Miocene sandstone, Nebraska
Edge of Ash bed in Oligocene-Miocene sandstone of the Arikaree Group, Scotts Bluff National Monument, Nebraska 220916-112)
Download ImageScotts Bluff and Great Plains, Nebraska
Flat-lying rocks of the Oligocene White River Group and overlying Oligocene-Miocene Arikaree Group form bluffs overlooking the Great Plains, Scotts Bluff National Monument, Nebraska (220916-110)
Download ImageConcretions and cross-bedded sandstone, Nebraska
Concretions and cross-bedded sandstone of the Oligocene-Miocene Arikaree Group, Nebraska (220916-109)
Download ImageProterozoic pegmatite in granite, Colorado
Lens of Proterozoic pegmatite in granite, Colorado (220916-103)
Download ImageProterozoic pegmatite in schist, Colorado
Proterozoic pegmatite forming small sills in schist, Colorado (220916-99)
Download ImageOil pump jack on Great Plains, SE Wyoming
Oil pump jack on Great Plains, southeastern Wyoming (220916-95)
Download ImageOil pump jack on Great Plains, SE Wyoming
Oil pump jack on Great Plains, southeastern Wyoming (220916-93)
Download ImageWhite River and Arikaree Groups, Nebraska
Oligocene White River and overlying Oligocene-Miocene Arikaree Group, W Nebraska (220916-90)
Download ImageBluffs of flat-lying Oligocene-Miocene rock, Nebraska
Bluffs of flat-lying Oligocene White River Group and Oligocene-Miocene Arikaree Group of Scotts Bluff National Monument, Nebraska
Download ImageWhite River and overlying Arikaree Groups, Nebraska
Eagle Rock, composed of approx flat-lying Oligocene White River Group and Oligocene-Miocene Arikaree Group of Scotts Bluff National Monument, Nebraska (220916-81)
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