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Vitrophyre near base of ash flow tuff, California
Vitrophyre (black volcanic glass) near base of 9.6 Ma (Miocene) ash flow tuff, Resting Springs Pass, near Shoshone, California (151128-23)
Download ImageBadwater Spring, Death Valley, California
Badwater Spring, Death Valley National Park, California (150425-33)
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Ptygmatically folded quartzite in marble
Ptygmatically folded quartzite in marble. Penny for scale (130323-53)
Download ImagePtygmatically folded quartzite in marble
ptygmatically folded quartzite in marble. Photo is about 10cm across the bottom.(130323-51)
Download ImageMetamorphosed conglomerate (vertical)
Stretched pebble metaconglomerate of the Proterozoic Kingston Peak Formation, Death Valley National Park, California. (190621-112) metamorphic
Download ImageMetamorphosed conglomerate (vertical)
Stretched pebble metaconglomerate of the Proterozoic Kingston Peak Formation, Death Valley National Park, California. (190621-111) metamorphic
Download ImageLahar deposit and Mt. Rainier, Washington
Lahar deposit and Mount Rainier. Mt. Rainier National Park, Washington (4MORA-94)
Download ImageLassen Peak, California
Lassen Peak, a 27,000 year old dacite plug that intruded Mt. Tehama (aka “Brokeoff Mountain”), an older stratovolcano of the Cascades arc. (IP1508-1685)
Download ImageMt. Rainier, Washington
Mount Rainier and Winthrop Glacier, Mt. Rainier National Park, Washington (4MORA-32)
Download ImageChaos Crags seen from Lassen summit, CA
View of Chaos Crags, recently emplaced (1100-1000 years old) dacite domes on the edge of Lassen Peak, California. Ash from the 1914-1915 eruptions on Lassen drapes the edge of the summit crater in the foreground. Lassen Volcanic National Park. (4Las-38)
Download ImageDacite lava, Lassen Peak summit, California
Dacite lava in the crater area of Lassen Peak from the 1914-1915 eruption. Lassen Volcanic National Park, California (4Las-33)
Download ImageLassen Peak and devastated area, California
Lassen Peak and devastation area from the 1914-1915 eruptions. (4Las-20)
Download ImageLassen Peak and Crescent Crater, CA
Lassen Peak and Crescent Crater. Lassen Volcanic National Park, California. (4Las-18)
Download ImageLassen Peak, California
Lassen Peak. Lassen Volcanic National Park, California. (4Las-15)
Download ImageTrough cross-bedding in sandstone
Trough cross-bedded tuff-rich sandstone of Miocene Simtustus Formation, Oregon. Hammer for scale. (211002-43)
Download ImageTrough cross-bedding in sandstone
Trough cross-bedded tuff-rich sandstone of Miocene Simtustus Formation, Oregon. (211002-42)
Download ImageTrough cross-bedding in sandstone
Trough cross-bedded tuff-rich sandstone of Miocene Simtustus Formation, Oregon. Hammer for scale. (211002-41)
Download ImageMt. Hood, Oregon (vertical)
Mount Hood, a stratovolcano of the High Cascades Volcanoes of Oregon. View from the southeast side of the mountain. (211002-32)
Download ImageMt. Hood, Oregon
Mount Hood, a stratovolcano of the High Cascades Volcanoes of Oregon. View from the southeast side of the mountain. (211002-29)
Download ImageMt. Hood, Oregon (vertical)
Mount Hood, a stratovolcano of the High Cascades Volcanoes of Oregon. View from the northeast side of the mountain. (211002-17)
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