phenocryst

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Columnar-jointed rhyolitic obsidian lava flow (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 14
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/39852797463.html" target="_blank"><img src="http://farm5.static.flickr.com/4809/39852797463_b21b075ca1_m.jpg" alt="" /></a><br />Columnar-jointed rhyolitic obsidian lava flow (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 14 / James St. John</span>

サイズ変更など

Columnar-jointed rhyolitic obsidian lava flow (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 16
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/46818034561.html" target="_blank"><img src="http://farm5.static.flickr.com/4843/46818034561_916afb90d7_m.jpg" alt="" /></a><br />Columnar-jointed rhyolitic obsidian lava flow (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 16 / James St. John</span>

サイズ変更など

Volcanic breccia (Upper Oligocene, 25 Ma; Narbona Pass Maar Volcano, near the summit of the Chuska Mountains, Navajo Volcanic Field, New Mexico, USA) 5
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/50960635826.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50960635826_3685c1a681_m.jpg" alt="" /></a><br />Volcanic breccia (Upper Oligocene, 25 Ma; Narbona Pass Maar Volcano, near the summit of the Chuska Mountains, Navajo Volcanic Field, New Mexico, USA) 5 / James St. John</span>

サイズ変更など

Columnar-jointed rhyolitic obsidian lava flow (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 18
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/45903096765.html" target="_blank"><img src="http://farm5.static.flickr.com/4895/45903096765_b319923ced_m.jpg" alt="" /></a><br />Columnar-jointed rhyolitic obsidian lava flow (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 18 / James St. John</span>

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Pinkish-reddish porphyritic dacite (Upper Pleistocene, 27 ka; Devastated Area, Lassen Volcano National Park, California, USA) 3
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/37306472330.html" target="_blank"><img src="http://farm5.static.flickr.com/4452/37306472330_4417d56269_m.jpg" alt="" /></a><br />Pinkish-reddish porphyritic dacite (Upper Pleistocene, 27 ka; Devastated Area, Lassen Volcano National Park, California, USA) 3 / James St. John</span>

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Wyomingite (Lower Pleistocene, 0.95 Ma; quarry on volcanic cone on Zirkel Mesa, Leucite Hills Volcanic Province, Wyoming, USA) 25
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/49992800827.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/49992800827_77a189c6e2_m.jpg" alt="" /></a><br />Wyomingite (Lower Pleistocene, 0.95 Ma; quarry on volcanic cone on Zirkel Mesa, Leucite Hills Volcanic Province, Wyoming, USA) 25 / James St. John</span>

サイズ変更など

Columnar-jointed rhyolitic obsidian lava flow (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 17
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/39852766783.html" target="_blank"><img src="http://farm8.static.flickr.com/7820/39852766783_05ecbc5fba_m.jpg" alt="" /></a><br />Columnar-jointed rhyolitic obsidian lava flow (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 17 / James St. John</span>

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Llao Rock (Crater Lake Caldera, Oregon, USA) 12
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/41107058475.html" target="_blank"><img src="http://farm1.static.flickr.com/906/41107058475_3b7ce658f0_m.jpg" alt="" /></a><br />Llao Rock (Crater Lake Caldera, Oregon, USA) 12 / James St. John</span>

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Sunstone (Tertiary; Spectrum Mine, Oregon, USA) 6
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/51660954738.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51660954738_d1fdc220bb_m.jpg" alt="" /></a><br />Sunstone (Tertiary; Spectrum Mine, Oregon, USA) 6 / James St. John</span>

サイズ変更など

Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 13
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/23723358448.html" target="_blank"><img src="http://farm5.static.flickr.com/4464/23723358448_3fefb1c5a1_m.jpg" alt="" /></a><br />Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 13 / James St. John</span>

サイズ変更など

Columnar-jointed rhyolitic obsidian lava flow (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 20
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/45903075895.html" target="_blank"><img src="http://farm5.static.flickr.com/4863/45903075895_2420c0522a_m.jpg" alt="" /></a><br />Columnar-jointed rhyolitic obsidian lava flow (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 20 / James St. John</span>

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Rhyodacite lava & pumice-fall deposit (Holocene, ~7.8 to 7.9 ka; eastern flanks of Llao Rock, Crater Lake Caldera, Oregon, USA) 4
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/28156045638.html" target="_blank"><img src="http://farm1.static.flickr.com/967/28156045638_7d70c487dc_m.jpg" alt="" /></a><br />Rhyodacite lava & pumice-fall deposit (Holocene, ~7.8 to 7.9 ka; eastern flanks of Llao Rock, Crater Lake Caldera, Oregon, USA) 4 / James St. John</span>

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Pinkish-reddish porphyritic dacite (Upper Pleistocene, 27 ka; Devastated Area, Lassen Volcano National Park, California, USA) 2
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/37517045886.html" target="_blank"><img src="http://farm5.static.flickr.com/4505/37517045886_98c2a4af0c_m.jpg" alt="" /></a><br />Pinkish-reddish porphyritic dacite (Upper Pleistocene, 27 ka; Devastated Area, Lassen Volcano National Park, California, USA) 2 / James St. John</span>

サイズ変更など

Sunstone (Tertiary; Spectrum Mine, Oregon, USA) 3
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/51661401994.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51661401994_65349b68f5_m.jpg" alt="" /></a><br />Sunstone (Tertiary; Spectrum Mine, Oregon, USA) 3 / James St. John</span>

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Rhyodacite vitrophyre (Llao Rock Rhyodacite, Holocene, ~7.8-7.9 ka; roadcut near Llao Rock, margin of Crater Lake Caldera, Oregon, USA) 30
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/27869128278.html" target="_blank"><img src="http://farm1.static.flickr.com/977/27869128278_75204c071c_m.jpg" alt="" /></a><br />Rhyodacite vitrophyre (Llao Rock Rhyodacite, Holocene, ~7.8-7.9 ka; roadcut near Llao Rock, margin of Crater Lake Caldera, Oregon, USA) 30 / James St. John</span>

サイズ変更など

Porphyritic granite (Giants Range Batholith, Neoarchean, 2.67-2.68 Ga; Rt. 1 roadcut north of the South Kawishiwi River, Minnesota, USA) 3
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/21431396082.html" target="_blank"><img src="http://farm6.static.flickr.com/5714/21431396082_ac92b7cc60_m.jpg" alt="" /></a><br />Porphyritic granite (Giants Range Batholith, Neoarchean, 2.67-2.68 Ga; Rt. 1 roadcut north of the South Kawishiwi River, Minnesota, USA) 3 / James St. John</span>

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Hot Creek (Long Valley Caldera, California, USA) 20
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/52330991184.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52330991184_affa8b0637_m.jpg" alt="" /></a><br />Hot Creek (Long Valley Caldera, California, USA) 20 / James St. John</span>

サイズ変更など

Porphyritic granite (Giants Range Batholith, Neoarchean, 2.67-2.68 Ga; Rt. 1 roadcut north of the South Kawishiwi River, Minnesota, USA) 2
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/21442356775.html" target="_blank"><img src="http://farm1.static.flickr.com/636/21442356775_6fe209dfc1_m.jpg" alt="" /></a><br />Porphyritic granite (Giants Range Batholith, Neoarchean, 2.67-2.68 Ga; Rt. 1 roadcut north of the South Kawishiwi River, Minnesota, USA) 2 / James St. John</span>

サイズ変更など

Columnar-jointed rhyolitic obsidian lava flow (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 15
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/46092985674.html" target="_blank"><img src="http://farm8.static.flickr.com/7819/46092985674_3d31416c7a_m.jpg" alt="" /></a><br />Columnar-jointed rhyolitic obsidian lava flow (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 15 / James St. John</span>

サイズ変更など

Sunstone (Tertiary; Spectrum Mine, Oregon, USA) 4
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/51661597540.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51661597540_e63eb3a7b5_m.jpg" alt="" /></a><br />Sunstone (Tertiary; Spectrum Mine, Oregon, USA) 4 / James St. John</span>

サイズ変更など

Sunstone (Tertiary; Spectrum Mine, Oregon, USA) 1
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/51661401169.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51661401169_379f6e5f96_m.jpg" alt="" /></a><br />Sunstone (Tertiary; Spectrum Mine, Oregon, USA) 1 / James St. John</span>

サイズ変更など

Wizard Island Cinder Cone (Holocene, ~7.2 ka; Crater Lake Caldera, Oregon, USA) 26
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/40150774703.html" target="_blank"><img src="http://farm8.static.flickr.com/7900/40150774703_cc3a75b76c_m.jpg" alt="" /></a><br />Wizard Island Cinder Cone (Holocene, ~7.2 ka; Crater Lake Caldera, Oregon, USA) 26 / James St. John</span>

サイズ変更など

Porphyritic granite (Giants Range Batholith, Neoarchean, 2.67-2.68 Ga; Rt. 1 roadcut north of the South Kawishiwi River, Minnesota, USA) 1
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/21254548028.html" target="_blank"><img src="http://farm1.static.flickr.com/668/21254548028_de0076bb6e_m.jpg" alt="" /></a><br />Porphyritic granite (Giants Range Batholith, Neoarchean, 2.67-2.68 Ga; Rt. 1 roadcut north of the South Kawishiwi River, Minnesota, USA) 1 / James St. John</span>

サイズ変更など

Chaos Crags volcanic domes & Chaos Jumbles Landslide (Holocene; Lassen Volcano National Park, California, USA) 3
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/37575357932.html" target="_blank"><img src="http://farm5.static.flickr.com/4445/37575357932_95e65fa6c8_m.jpg" alt="" /></a><br />Chaos Crags volcanic domes & Chaos Jumbles Landslide (Holocene; Lassen Volcano National Park, California, USA) 3 / James St. John</span>

サイズ変更など

Vesicular lava (July-August 2001 eruption of Mt. Etna, eastern Sicily) 3
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/51023509068.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51023509068_569e44b358_m.jpg" alt="" /></a><br />Vesicular lava (July-August 2001 eruption of Mt. Etna, eastern Sicily) 3 / James St. John</span>

サイズ変更など

Hot Creek Rhyolite Flow (Pleistocene, 288 or 333 ka; Hot Creek Gorge, Long Valley Caldera, California, USA) 16
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/52316224213.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52316224213_2d5d7bd184_m.jpg" alt="" /></a><br />Hot Creek Rhyolite Flow (Pleistocene, 288 or 333 ka; Hot Creek Gorge, Long Valley Caldera, California, USA) 16 / James St. John</span>

サイズ変更など

Pilot Butte (Pliocene madupite lamproite volcanic center in the Leucite Hills, Wyoming, USA) 22
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/48931658093.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48931658093_cdab366679_m.jpg" alt="" /></a><br />Pilot Butte (Pliocene madupite lamproite volcanic center in the Leucite Hills, Wyoming, USA) 22 / James St. John</span>

サイズ変更など

Dome C and Dome E of Chaos Crags volcanic domes (Holocene; Lassen Volcano National Park, California, USA) 1
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/36897085044.html" target="_blank"><img src="http://farm5.static.flickr.com/4505/36897085044_62d1f64aaa_m.jpg" alt="" /></a><br />Dome C and Dome E of Chaos Crags volcanic domes (Holocene; Lassen Volcano National Park, California, USA) 1 / James St. John</span>

サイズ変更など

Pinkish-reddish porphyritic dacite (Upper Pleistocene, 27 ka; Devastated Area, Lassen Volcano National Park, California, USA) 4
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/23712893738.html" target="_blank"><img src="http://farm5.static.flickr.com/4483/23712893738_4017220a04_m.jpg" alt="" /></a><br />Pinkish-reddish porphyritic dacite (Upper Pleistocene, 27 ka; Devastated Area, Lassen Volcano National Park, California, USA) 4 / James St. John</span>

サイズ変更など

Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 47
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/37544382372.html" target="_blank"><img src="http://farm5.static.flickr.com/4498/37544382372_190c5cf236_m.jpg" alt="" /></a><br />Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 47 / James St. John</span>

サイズ変更など

Partially devitrified rhyolitic obsidian with lithophysa (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 6
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/45894579765.html" target="_blank"><img src="http://farm8.static.flickr.com/7828/45894579765_92c499be6f_m.jpg" alt="" /></a><br />Partially devitrified rhyolitic obsidian with lithophysa (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 6 / James St. John</span>

サイズ変更など

Rhyodacite vitrophyre (Llao Rock Rhyodacite, Holocene, ~7.8-7.9 ka; roadcut near Llao Rock, margin of Crater Lake Caldera, Oregon, USA) 60
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/26870998187.html" target="_blank"><img src="http://farm1.static.flickr.com/830/26870998187_66bc27d182_m.jpg" alt="" /></a><br />Rhyodacite vitrophyre (Llao Rock Rhyodacite, Holocene, ~7.8-7.9 ka; roadcut near Llao Rock, margin of Crater Lake Caldera, Oregon, USA) 60 / James St. John</span>

サイズ変更など

Volcanic breccia (Upper Oligocene, 25 Ma; Narbona Pass Maar Volcano, near the summit of the Chuska Mountains, Navajo Volcanic Field, New Mexico, USA) 13
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/51021682317.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51021682317_2e6bd20b8f_m.jpg" alt="" /></a><br />Volcanic breccia (Upper Oligocene, 25 Ma; Narbona Pass Maar Volcano, near the summit of the Chuska Mountains, Navajo Volcanic Field, New Mexico, USA) 13 / James St. John</span>

サイズ変更など

Sunstone (Tertiary; Spectrum Mine, Oregon, USA) 2
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/51660954948.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51660954948_6ccb0b0a60_m.jpg" alt="" /></a><br />Sunstone (Tertiary; Spectrum Mine, Oregon, USA) 2 / James St. John</span>

サイズ変更など

Volcanic breccia (Upper Oligocene, 25 Ma; Narbona Pass Maar Volcano, near the summit of the Chuska Mountains, Navajo Volcanic Field, New Mexico, USA) 16
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/51020850408.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51020850408_1180023a7e_m.jpg" alt="" /></a><br />Volcanic breccia (Upper Oligocene, 25 Ma; Narbona Pass Maar Volcano, near the summit of the Chuska Mountains, Navajo Volcanic Field, New Mexico, USA) 16 / James St. John</span>

サイズ変更など

Kimberlite (Snegurochka Pipe, Late Devonian; Arkhangelsk Region, Russia) 4
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/50599250063.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50599250063_7ee96055cb_m.jpg" alt="" /></a><br />Kimberlite (Snegurochka Pipe, Late Devonian; Arkhangelsk Region, Russia) 4 / James St. John</span>

サイズ変更など

Micaceous kimberlite (Stockdale Diatreme, Cretaceous; Riley County, Kansas, USA) 23
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/53552865068.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/53552865068_73e8a7d89b_m.jpg" alt="" /></a><br />Micaceous kimberlite (Stockdale Diatreme, Cretaceous; Riley County, Kansas, USA) 23 / James St. John</span>

サイズ変更など

Volcanic breccia (Upper Oligocene, 25 Ma; Narbona Pass Maar Volcano, near the summit of the Chuska Mountains, Navajo Volcanic Field, New Mexico, USA) 15
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/51020850933.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51020850933_d9dde6e36f_m.jpg" alt="" /></a><br />Volcanic breccia (Upper Oligocene, 25 Ma; Narbona Pass Maar Volcano, near the summit of the Chuska Mountains, Navajo Volcanic Field, New Mexico, USA) 15 / James St. John</span>

サイズ変更など

Rhyodacite vitrophyre (Llao Rock Rhyodacite, Holocene, ~7.8-7.9 ka; roadcut near Llao Rock, margin of Crater Lake Caldera, Oregon, USA) 2
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/26862451647.html" target="_blank"><img src="http://farm1.static.flickr.com/961/26862451647_813a1a15ab_m.jpg" alt="" /></a><br />Rhyodacite vitrophyre (Llao Rock Rhyodacite, Holocene, ~7.8-7.9 ka; roadcut near Llao Rock, margin of Crater Lake Caldera, Oregon, USA) 2 / James St. John</span>

サイズ変更など

Rhyodacite vitrophyre (Llao Rock Rhyodacite, Holocene, ~7.8-7.9 ka; roadcut near Llao Rock, margin of Crater Lake Caldera, Oregon, USA) 13
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/41730417791.html" target="_blank"><img src="http://farm1.static.flickr.com/978/41730417791_cece87d917_m.jpg" alt="" /></a><br />Rhyodacite vitrophyre (Llao Rock Rhyodacite, Holocene, ~7.8-7.9 ka; roadcut near Llao Rock, margin of Crater Lake Caldera, Oregon, USA) 13 / James St. John</span>

サイズ変更など

Fault in volcanic breccia (Upper Oligocene, 25 Ma; Narbona Pass Maar Volcano, near the summit of the Chuska Mountains, Navajo Volcanic Field, New Mexico, USA)
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/51021681467.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51021681467_26370716dc_m.jpg" alt="" /></a><br />Fault in volcanic breccia (Upper Oligocene, 25 Ma; Narbona Pass Maar Volcano, near the summit of the Chuska Mountains, Navajo Volcanic Field, New Mexico, USA) / James St. John</span>

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Wyomingite (Lower Pleistocene, 0.95 Ma; quarry on volcanic cone on Zirkel Mesa, Leucite Hills Volcanic Province, Wyoming, USA) 5
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/49978876848.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/49978876848_f8e583f746_m.jpg" alt="" /></a><br />Wyomingite (Lower Pleistocene, 0.95 Ma; quarry on volcanic cone on Zirkel Mesa, Leucite Hills Volcanic Province, Wyoming, USA) 5 / James St. John</span>

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Rhyodacite vitrophyre (Llao Rock Rhyodacite, Holocene, ~7.8-7.9 ka; roadcut near Llao Rock, margin of Crater Lake Caldera, Oregon, USA) 49
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/41698347632.html" target="_blank"><img src="http://farm1.static.flickr.com/909/41698347632_c3ea149497_m.jpg" alt="" /></a><br />Rhyodacite vitrophyre (Llao Rock Rhyodacite, Holocene, ~7.8-7.9 ka; roadcut near Llao Rock, margin of Crater Lake Caldera, Oregon, USA) 49 / James St. John</span>

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Porphyritic rhyolite (Cenozoic; Chaffee County, Colorado, USA) 4
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/51646512424.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51646512424_e13c9da1c8_m.jpg" alt="" /></a><br />Porphyritic rhyolite (Cenozoic; Chaffee County, Colorado, USA) 4 / James St. John</span>

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Wizard Island Cinder Cone (Holocene, ~7.2 ka; Crater Lake Caldera, Oregon, USA) 27
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/33240143538.html" target="_blank"><img src="http://farm8.static.flickr.com/7876/33240143538_82e048d35f_m.jpg" alt="" /></a><br />Wizard Island Cinder Cone (Holocene, ~7.2 ka; Crater Lake Caldera, Oregon, USA) 27 / James St. John</span>

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Crater Lake Caldera (Oregon, USA) 96
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/46201525785.html" target="_blank"><img src="http://farm8.static.flickr.com/7890/46201525785_cb83696250_m.jpg" alt="" /></a><br />Crater Lake Caldera (Oregon, USA) 96 / James St. John</span>

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Llao Rock (Crater Lake Caldera, Oregon, USA) 6
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/28132810358.html" target="_blank"><img src="http://farm1.static.flickr.com/957/28132810358_c1bbd09584_m.jpg" alt="" /></a><br />Llao Rock (Crater Lake Caldera, Oregon, USA) 6 / James St. John</span>

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Porphyritic granite (Giants Range Batholith, Neoarchean, 2.67-2.68 Ga; Rt. 1 roadcut north of the South Kawishiwi River, Minnesota, USA) 7
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/21255401639.html" target="_blank"><img src="http://farm6.static.flickr.com/5812/21255401639_6080f9de81_m.jpg" alt="" /></a><br />Porphyritic granite (Giants Range Batholith, Neoarchean, 2.67-2.68 Ga; Rt. 1 roadcut north of the South Kawishiwi River, Minnesota, USA) 7 / James St. John</span>

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Aphyric & partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 10
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/39844313633.html" target="_blank"><img src="http://farm5.static.flickr.com/4877/39844313633_1cc47b6288_m.jpg" alt="" /></a><br />Aphyric & partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 10 / James St. John</span>

サイズ変更など

Porphyritic granite (Giants Range Batholith, Neoarchean, 2.67-2.68 Ga; Rt. 1 roadcut north of the South Kawishiwi River, Minnesota, USA) 8
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/21442283065.html" target="_blank"><img src="http://farm6.static.flickr.com/5713/21442283065_e94d7b8f45_m.jpg" alt="" /></a><br />Porphyritic granite (Giants Range Batholith, Neoarchean, 2.67-2.68 Ga; Rt. 1 roadcut north of the South Kawishiwi River, Minnesota, USA) 8 / James St. John</span>

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Kimberlite (Snegurochka Pipe, Late Devonian; Arkhangelsk Region, Russia) 8
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/50600109537.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50600109537_96a591b2ac_m.jpg" alt="" /></a><br />Kimberlite (Snegurochka Pipe, Late Devonian; Arkhangelsk Region, Russia) 8 / James St. John</span>

サイズ変更など

Porphyritic shoshonite (Denver Formation, 63-64 Ma, Lower Paleocene; Table Mountain, Golden, Colorado, USA) 1
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/52772901281.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52772901281_eb948cf7c2_m.jpg" alt="" /></a><br />Porphyritic shoshonite (Denver Formation, 63-64 Ma, Lower Paleocene; Table Mountain, Golden, Colorado, USA) 1 / James St. John</span>

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Volcanic breccia (Upper Oligocene, 25 Ma; Narbona Pass Maar Volcano, near the summit of the Chuska Mountains, Navajo Volcanic Field, New Mexico, USA) 14
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/51021680802.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51021680802_2d94c39a2f_m.jpg" alt="" /></a><br />Volcanic breccia (Upper Oligocene, 25 Ma; Narbona Pass Maar Volcano, near the summit of the Chuska Mountains, Navajo Volcanic Field, New Mexico, USA) 14 / James St. John</span>

サイズ変更など

Aphyric & partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 12
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/46084670744.html" target="_blank"><img src="http://farm5.static.flickr.com/4817/46084670744_c7f76521a8_m.jpg" alt="" /></a><br />Aphyric & partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 12 / James St. John</span>

サイズ変更など

Rhyodacite vitrophyre (Llao Rock Rhyodacite, Holocene, ~7.8-7.9 ka; roadcut near Llao Rock, margin of Crater Lake Caldera, Oregon, USA) 41
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/41697649072.html" target="_blank"><img src="http://farm1.static.flickr.com/868/41697649072_d16c6878b2_m.jpg" alt="" /></a><br />Rhyodacite vitrophyre (Llao Rock Rhyodacite, Holocene, ~7.8-7.9 ka; roadcut near Llao Rock, margin of Crater Lake Caldera, Oregon, USA) 41 / James St. John</span>

サイズ変更など

Rhyodacite vitrophyre (Llao Rock Rhyodacite, Holocene, ~7.8-7.9 ka; roadcut near Llao Rock, margin of Crater Lake Caldera, Oregon, USA) 11
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/27861719758.html" target="_blank"><img src="http://farm1.static.flickr.com/904/27861719758_ed6177855c_m.jpg" alt="" /></a><br />Rhyodacite vitrophyre (Llao Rock Rhyodacite, Holocene, ~7.8-7.9 ka; roadcut near Llao Rock, margin of Crater Lake Caldera, Oregon, USA) 11 / James St. John</span>

サイズ変更など

Volcanic lapilli (7 March 2021 eruption of Mt. Etna, eastern Sicily) 2
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/51104982860.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51104982860_89ab74bc47_m.jpg" alt="" /></a><br />Volcanic lapilli (7 March 2021 eruption of Mt. Etna, eastern Sicily) 2 / James St. John</span>

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Pilot Butte (Pliocene madupite lamproite volcanic center in the Leucite Hills, Wyoming, USA) 15
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/48931023928.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48931023928_c3708b3c96_m.jpg" alt="" /></a><br />Pilot Butte (Pliocene madupite lamproite volcanic center in the Leucite Hills, Wyoming, USA) 15 / James St. John</span>

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Altered andesite (Phantom Cone Andesite, Middle Pleistocene, 346-403 ka; Phantom Ship Island, Crater Lake Caldera, Oregon, USA) 8
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/32261095187.html" target="_blank"><img src="http://farm8.static.flickr.com/7902/32261095187_f2948f8b5d_m.jpg" alt="" /></a><br />Altered andesite (Phantom Cone Andesite, Middle Pleistocene, 346-403 ka; Phantom Ship Island, Crater Lake Caldera, Oregon, USA) 8 / James St. John</span>

サイズ変更など

Aphyric & partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 14
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/46084659804.html" target="_blank"><img src="http://farm5.static.flickr.com/4856/46084659804_1891af21f1_m.jpg" alt="" /></a><br />Aphyric & partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 14 / James St. John</span>

サイズ変更など

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