phenocryst

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Quenched blob in pinkish-reddish porphyritic dacite (Upper Pleistocene, 27 ka; Devastated Area, 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/37306433770.html" target="_blank"><img src="http://farm5.static.flickr.com/4502/37306433770_aba578c143_m.jpg" alt="" /></a><br />Quenched blob in pinkish-reddish porphyritic dacite (Upper Pleistocene, 27 ka; Devastated Area, Lassen Volcano National Park, California, USA) 1 / James St. John</span>

サイズ変更など

Partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, 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/45889992095.html" target="_blank"><img src="http://farm8.static.flickr.com/7809/45889992095_c22630e8ce_m.jpg" alt="" /></a><br />Partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 2 / 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) 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/27863718558.html" target="_blank"><img src="http://farm1.static.flickr.com/950/27863718558_59624bf545_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) 27 / 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) 9
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/52307423516.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52307423516_07a7f7025b_m.jpg" alt="" /></a><br />Hot Creek Rhyolite Flow (Pleistocene, 288 or 333 ka; Hot Creek Gorge, Long Valley Caldera, California, USA) 9 / James St. John</span>

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Denver & Rio Grande Western Railroad # 683 steam locomotive (Baldwin C-28 2-8-0) 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/22127978984.html" target="_blank"><img src="http://farm6.static.flickr.com/5761/22127978984_b2d6895312_m.jpg" alt="" /></a><br />Denver & Rio Grande Western Railroad # 683 steam locomotive (Baldwin C-28 2-8-0) 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) 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/37317355920.html" target="_blank"><img src="http://farm5.static.flickr.com/4500/37317355920_2254d79593_m.jpg" alt="" /></a><br />Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 25 / James St. John</span>

サイズ変更など

Aphyric rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, 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/31863628447.html" target="_blank"><img src="http://farm8.static.flickr.com/7808/31863628447_9e626b3aba_m.jpg" alt="" /></a><br />Aphyric rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 2 / James St. John</span>

サイズ変更など

Mount Scott Volcano (Crater Lake National Park, Oregon, 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/41147906785.html" target="_blank"><img src="http://farm1.static.flickr.com/904/41147906785_e298db70ca_m.jpg" alt="" /></a><br />Mount Scott Volcano (Crater Lake National Park, Oregon, USA) 10 / James St. John</span>

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Partially devitrified rhyolitic obsidian with lithophysae (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, 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/46809164441.html" target="_blank"><img src="http://farm8.static.flickr.com/7890/46809164441_457c44bd6c_m.jpg" alt="" /></a><br />Partially devitrified rhyolitic obsidian with lithophysae (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 1 / James St. John</span>

サイズ変更など

Partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, 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/46805438391.html" target="_blank"><img src="http://farm8.static.flickr.com/7800/46805438391_7b67ddfc4b_m.jpg" alt="" /></a><br />Partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 3 / 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) 54
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/23724575418.html" target="_blank"><img src="http://farm5.static.flickr.com/4476/23724575418_be1a77df74_m.jpg" alt="" /></a><br />Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 54 / James St. John</span>

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Pilot Butte (Pliocene madupite lamproite volcanic center in the Leucite Hills, Wyoming, 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/48927040383.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48927040383_51563af146_m.jpg" alt="" /></a><br />Pilot Butte (Pliocene madupite lamproite volcanic center in the Leucite Hills, Wyoming, USA) 3 / James St. John</span>

サイズ変更など

Trachyte obsidian (Quaternary; Ol Doinyo Nyukie Volcano, Kenya) 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/50732153848.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50732153848_2803cde19b_m.jpg" alt="" /></a><br />Trachyte obsidian (Quaternary; Ol Doinyo Nyukie Volcano, Kenya) 2 / 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) 32
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/23724035948.html" target="_blank"><img src="http://farm5.static.flickr.com/4502/23724035948_d9f55e5090_m.jpg" alt="" /></a><br />Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 32 / James St. John</span>

サイズ変更など

Kimberlite (Snegurochka Pipe, Late Devonian; Arkhangelsk Region, Russia) 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/50600109997.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50600109997_2ee9941566_m.jpg" alt="" /></a><br />Kimberlite (Snegurochka Pipe, Late Devonian; Arkhangelsk Region, Russia) 7 / 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) 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/50959934388.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50959934388_259cbbf782_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) 4 / James St. John</span>

サイズ変更など

Kimberlite (Gates-Adah Kimberlite Dike, Early Jurassic; Fayette County, Pennsylvania, 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/48353987427.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48353987427_c1ebace966_m.jpg" alt="" /></a><br />Kimberlite (Gates-Adah Kimberlite Dike, Early Jurassic; Fayette County, Pennsylvania, USA) 4 / James St. John</span>

サイズ変更など

Mount Scott Volcano (Crater Lake National Park, 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/42055539502.html" target="_blank"><img src="http://farm1.static.flickr.com/978/42055539502_30995f942a_m.jpg" alt="" /></a><br />Mount Scott Volcano (Crater Lake National Park, Oregon, USA) 12 / James St. John</span>

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Columnar-jointed rhyolitic obsidian lava flow (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 32
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/31877698467.html" target="_blank"><img src="http://farm8.static.flickr.com/7904/31877698467_83fb204ee0_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) 32 / 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) 59
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/37544581212.html" target="_blank"><img src="http://farm5.static.flickr.com/4476/37544581212_74b7ab9d1f_m.jpg" alt="" /></a><br />Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 59 / James St. John</span>

サイズ変更など

Garnetiferous metanorthosite (Marcy Anorthosite, Mesoproterozoic, 1155 Ma; Rt. 73 roadcut near Chapel Pond, Adirondack Mountains, New York State, 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/30779518243.html" target="_blank"><img src="http://farm1.static.flickr.com/376/30779518243_23a65eeaee_m.jpg" alt="" /></a><br />Garnetiferous metanorthosite (Marcy Anorthosite, Mesoproterozoic, 1155 Ma; Rt. 73 roadcut near Chapel Pond, Adirondack Mountains, New York State, USA) 2 / 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) 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/52772371742.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52772371742_c2ea226fca_m.jpg" alt="" /></a><br />Porphyritic shoshonite (Denver Formation, 63-64 Ma, Lower Paleocene; Table Mountain, Golden, Colorado, 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) 35
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/36865938814.html" target="_blank"><img src="http://farm5.static.flickr.com/4499/36865938814_48d2b88ca2_m.jpg" alt="" /></a><br />Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 35 / James St. John</span>

サイズ変更など

Partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, 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/31863607667.html" target="_blank"><img src="http://farm5.static.flickr.com/4869/31863607667_cbf2ee110d_m.jpg" alt="" /></a><br />Partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 1 / James St. John</span>

サイズ変更など

Kimberlite (Gates-Adah Kimberlite Dike, Early Jurassic; Fayette County, Pennsylvania, 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/48353943987.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48353943987_ddbcb2e519_m.jpg" alt="" /></a><br />Kimberlite (Gates-Adah Kimberlite Dike, Early Jurassic; Fayette County, Pennsylvania, USA) 16 / James St. John</span>

サイズ変更など

Porphyritic leucite lava (Caprarola, Vico Lake, Viterbo, Italy) 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/51196060636.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51196060636_b9d28eba47_m.jpg" alt="" /></a><br />Porphyritic leucite lava (Caprarola, Vico Lake, Viterbo, Italy) 1 / 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) 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/37348894720.html" target="_blank"><img src="http://farm5.static.flickr.com/4462/37348894720_b98e00fe64_m.jpg" alt="" /></a><br />Dome C and Dome E of Chaos Crags volcanic domes (Holocene; Lassen Volcano National Park, California, USA) 2 / James St. John</span>

サイズ変更など

Phenotrachytic welded tuff (Wall Mountain Tuff, Middle Eocene, 36.73 Ma; Teller County, 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/30870125514.html" target="_blank"><img src="http://farm1.static.flickr.com/449/30870125514_e7596c9a8f_m.jpg" alt="" /></a><br />Phenotrachytic welded tuff (Wall Mountain Tuff, Middle Eocene, 36.73 Ma; Teller County, Colorado, USA) 1 / James St. John</span>

サイズ変更など

Porphyritic phonolite (Shonkin Sag Laccolith, Early Eocene, 50-53 Ma; Buck Ranch, Highwood Mountains, Montana, 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/49061149591.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/49061149591_a75e1f8d8a_m.jpg" alt="" /></a><br />Porphyritic phonolite (Shonkin Sag Laccolith, Early Eocene, 50-53 Ma; Buck Ranch, Highwood Mountains, Montana, USA) 1 / James St. John</span>

サイズ変更など

Altered andesite (Phantom Cone Andesite, Middle Pleistocene, 346-403 ka; Phantom Ship Island, Crater Lake Caldera, 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/27201413507.html" target="_blank"><img src="http://farm1.static.flickr.com/981/27201413507_f69cdd75c9_m.jpg" alt="" /></a><br />Altered andesite (Phantom Cone Andesite, Middle Pleistocene, 346-403 ka; Phantom Ship Island, Crater Lake Caldera, Oregon, USA) 1 / 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) 31
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/23724049698.html" target="_blank"><img src="http://farm5.static.flickr.com/4457/23724049698_b56a3e8db5_m.jpg" alt="" /></a><br />Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 31 / James St. John</span>

サイズ変更など

Quenched blob in pinkish-reddish porphyritic dacite (Upper Pleistocene, 27 ka; Devastated Area, Lassen Volcano National Park, California, 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/36855366914.html" target="_blank"><img src="http://farm5.static.flickr.com/4494/36855366914_77ccd57905_m.jpg" alt="" /></a><br />Quenched blob in pinkish-reddish porphyritic dacite (Upper Pleistocene, 27 ka; Devastated Area, Lassen Volcano National Park, California, USA) 8 / James St. John</span>

サイズ変更など

Wizard Island Cinder Cone (Holocene, ~7.2 ka; Crater Lake Caldera, Oregon, USA) 28
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/47115620101.html" target="_blank"><img src="http://farm8.static.flickr.com/7828/47115620101_a8772c7902_m.jpg" alt="" /></a><br />Wizard Island Cinder Cone (Holocene, ~7.2 ka; Crater Lake Caldera, Oregon, USA) 28 / James St. John</span>

サイズ変更など

Kimberlite (Gates-Adah Kimberlite Dike, Early Jurassic; Fayette County, Pennsylvania, 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/48353947387.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48353947387_88fb230079_m.jpg" alt="" /></a><br />Kimberlite (Gates-Adah Kimberlite Dike, Early Jurassic; Fayette County, Pennsylvania, USA) 15 / 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) 19
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/37527428866.html" target="_blank"><img src="http://farm5.static.flickr.com/4502/37527428866_20afe472e6_m.jpg" alt="" /></a><br />Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 19 / James St. John</span>

サイズ変更など

Llao Rock (Crater Lake Caldera, Oregon, 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/42005124931.html" target="_blank"><img src="http://farm1.static.flickr.com/908/42005124931_64ab0b1351_m.jpg" alt="" /></a><br />Llao Rock (Crater Lake Caldera, Oregon, USA) 5 / James St. John</span>

サイズ変更など

Porphyritic intrusive igneous rocks (Cretaceous or Tertiary; Hellroaring Road, Rock Creek Canyon, Beartooth Mountains, Montana, 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/52477694746.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52477694746_471f97aa26_m.jpg" alt="" /></a><br />Porphyritic intrusive igneous rocks (Cretaceous or Tertiary; Hellroaring Road, Rock Creek Canyon, Beartooth Mountains, Montana, 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) 24
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/37575924341.html" target="_blank"><img src="http://farm5.static.flickr.com/4497/37575924341_fb2053432b_m.jpg" alt="" /></a><br />Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 24 / 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) 9
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/37565685511.html" target="_blank"><img src="http://farm5.static.flickr.com/4482/37565685511_6c2408f854_m.jpg" alt="" /></a><br />Pinkish-reddish porphyritic dacite (Upper Pleistocene, 27 ka; Devastated Area, Lassen Volcano National Park, California, USA) 9 / 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) 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/37527474716.html" target="_blank"><img src="http://farm5.static.flickr.com/4455/37527474716_c631d7ffdc_m.jpg" alt="" /></a><br />Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 17 / James St. John</span>

サイズ変更など

Rhyolite (Palisade Rhyolite, North Shore Volcanic Group, Mesoproterozoic, 1096-1097 Ma; Rt. 1 roadcut just north of Ilgen City, Minnesota, 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/22730180354.html" target="_blank"><img src="http://farm1.static.flickr.com/663/22730180354_4767bce73a_m.jpg" alt="" /></a><br />Rhyolite (Palisade Rhyolite, North Shore Volcanic Group, Mesoproterozoic, 1096-1097 Ma; Rt. 1 roadcut just north of Ilgen City, Minnesota, USA) 11 / 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) 43
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/26870082387.html" target="_blank"><img src="http://farm1.static.flickr.com/832/26870082387_223344aaf2_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) 43 / 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) 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/46756665052.html" target="_blank"><img src="http://farm5.static.flickr.com/4889/46756665052_e2b3dc1f3f_m.jpg" alt="" /></a><br />Aphyric & partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 3 / James St. John</span>

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Kimberlite (Gates-Adah Kimberlite Dike, Early Jurassic; Fayette County, Pennsylvania, 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/48353820606.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48353820606_ec88046b5a_m.jpg" alt="" /></a><br />Kimberlite (Gates-Adah Kimberlite Dike, Early Jurassic; Fayette County, Pennsylvania, USA) 14 / James St. John</span>

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Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 46
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/37544405192.html" target="_blank"><img src="http://farm5.static.flickr.com/4450/37544405192_fe5ca7dbee_m.jpg" alt="" /></a><br />Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 46 / James St. John</span>

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Porphyritic phonolite (Shonkin Sag Laccolith, Early Eocene, 50-53 Ma; Buck Ranch, Highwood Mountains, Montana, 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/49060639443.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/49060639443_9d200ac725_m.jpg" alt="" /></a><br />Porphyritic phonolite (Shonkin Sag Laccolith, Early Eocene, 50-53 Ma; Buck Ranch, Highwood Mountains, Montana, USA) 2 / James St. John</span>

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Llao Rock (Crater Lake Caldera, Oregon, 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/41287527874.html" target="_blank"><img src="http://farm1.static.flickr.com/957/41287527874_f952496de6_m.jpg" alt="" /></a><br />Llao Rock (Crater Lake Caldera, Oregon, USA) 16 / James St. John</span>

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Kimberlite (Gates-Adah Kimberlite Dike, Early Jurassic; Fayette County, Pennsylvania, USA) 9
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/48353968792.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48353968792_338b2fdd28_m.jpg" alt="" /></a><br />Kimberlite (Gates-Adah Kimberlite Dike, Early Jurassic; Fayette County, Pennsylvania, USA) 9 / 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) 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/31867582897.html" target="_blank"><img src="http://farm5.static.flickr.com/4868/31867582897_956b895b0d_m.jpg" alt="" /></a><br />Aphyric & partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 4 / James St. John</span>

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Rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, 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/46756627182.html" target="_blank"><img src="http://farm8.static.flickr.com/7806/46756627182_c171ffc421_m.jpg" alt="" /></a><br />Rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 2 / James St. John</span>

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Millbrig Bentonite (Upper Ordovician, 454 Ma; Warren County core, Ohio, 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/32326361998.html" target="_blank"><img src="http://farm5.static.flickr.com/4866/32326361998_4622599863_m.jpg" alt="" /></a><br />Millbrig Bentonite (Upper Ordovician, 454 Ma; Warren County core, Ohio, USA) 4 / James St. John</span>

サイズ変更など

Kimberlite (Gates-Adah Kimberlite Dike, Early Jurassic; Fayette County, Pennsylvania, 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/48353842206.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48353842206_90e6dd4612_m.jpg" alt="" /></a><br />Kimberlite (Gates-Adah Kimberlite Dike, Early Jurassic; Fayette County, Pennsylvania, USA) 8 / James St. John</span>

サイズ変更など

Kimberlite (Gates-Adah Kimberlite Dike, Early Jurassic; Fayette County, Pennsylvania, 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/48353940212.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48353940212_88ac71267c_m.jpg" alt="" /></a><br />Kimberlite (Gates-Adah Kimberlite Dike, Early Jurassic; Fayette County, Pennsylvania, USA) 3 / 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) 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/37575714841.html" target="_blank"><img src="http://farm5.static.flickr.com/4446/37575714841_2d54ffeea6_m.jpg" alt="" /></a><br />Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 7 / James St. John</span>

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Llao Rock (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/41962656652.html" target="_blank"><img src="http://farm1.static.flickr.com/973/41962656652_f8a6ab9327_m.jpg" alt="" /></a><br />Llao Rock (Crater Lake Caldera, Oregon, USA) 11 / James St. John</span>

サイズ変更など

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/31867552197.html" target="_blank"><img src="http://farm8.static.flickr.com/7811/31867552197_b4f58e9b63_m.jpg" alt="" /></a><br />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

Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 29
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/37317781230.html" target="_blank"><img src="http://farm5.static.flickr.com/4486/37317781230_968e7f18c6_m.jpg" alt="" /></a><br />Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 29 / James St. John</span>

サイズ変更など

Partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, 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/46805428071.html" target="_blank"><img src="http://farm8.static.flickr.com/7851/46805428071_278b42dcd8_m.jpg" alt="" /></a><br />Partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 4 / James St. John</span>

サイズ変更など

Vesicular andesite (Upper Pliocene, 1.9 Ma; Sierra Grande Shield Volcano, Raton-Clayton Volcanic Field, New Mexico, USA) 9
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/50995062217.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50995062217_36d386540e_m.jpg" alt="" /></a><br />Vesicular andesite (Upper Pliocene, 1.9 Ma; Sierra Grande Shield Volcano, Raton-Clayton Volcanic Field, New Mexico, USA) 9 / James St. John</span>

サイズ変更など

Wizard Island Cinder Cone (Holocene, ~7.2 ka; Crater Lake Caldera, Oregon, USA) 32
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/47115842511.html" target="_blank"><img src="http://farm8.static.flickr.com/7903/47115842511_4802468fec_m.jpg" alt="" /></a><br />Wizard Island Cinder Cone (Holocene, ~7.2 ka; Crater Lake Caldera, Oregon, USA) 32 / James St. John</span>

サイズ変更など

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