phenocryst

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Dome F of Chaos Crags volcanic domes (Holocene; Lassen Volcano National Park, California, USA) 2
by James St. John

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/37575470362.html" target="_blank"><img src="http://farm5.static.flickr.com/4475/37575470362_1027a6d492_m.jpg" alt="" /></a><br />Dome F of Chaos Crags volcanic domes (Holocene; Lassen Volcano National Park, California, USA) 2 / James St. John</span>

サイズ変更など

Crater Lake Caldera (Oregon, USA) 83
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/40150653783.html" target="_blank"><img src="http://farm8.static.flickr.com/7925/40150653783_7abaaa31ed_m.jpg" alt="" /></a><br />Crater Lake Caldera (Oregon, USA) 83 / James St. John</span>

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Vesicular tholeiitic olivine basalt (Boring Volcanic Field, Upper Pliocene, probably ~3 Ma; Crown Point roadcut, Multnomah County, 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/26088896670.html" target="_blank"><img src="http://farm2.static.flickr.com/1551/26088896670_a95084d283_m.jpg" alt="" /></a><br />Vesicular tholeiitic olivine basalt (Boring Volcanic Field, Upper Pliocene, probably ~3 Ma; Crown Point roadcut, Multnomah County, Oregon, USA) 1 / James St. John</span>

サイズ変更など

Porphyritic leucite lava (Caprarola, Vico Lake, Viterbo, Italy) 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/51197126825.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51197126825_329eb4f538_m.jpg" alt="" /></a><br />Porphyritic leucite lava (Caprarola, Vico Lake, Viterbo, Italy) 4 / James St. John</span>

サイズ変更など

Mount Scott Volcano (Crater Lake National Park, 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/28156743228.html" target="_blank"><img src="http://farm1.static.flickr.com/943/28156743228_a4b4b72ae8_m.jpg" alt="" /></a><br />Mount Scott Volcano (Crater Lake National Park, Oregon, USA) 4 / James St. John</span>

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Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, 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/36906181333.html" target="_blank"><img src="http://farm5.static.flickr.com/4484/36906181333_74686ecc89_m.jpg" alt="" /></a><br />Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 22 / 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) 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/37543739482.html" target="_blank"><img src="http://farm5.static.flickr.com/4483/37543739482_8e7b4f48ae_m.jpg" alt="" /></a><br />Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 1 / James St. John</span>

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Porphyritic andesite (Boulder County, Colorado, 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/52150841890.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52150841890_b0db865224_m.jpg" alt="" /></a><br />Porphyritic andesite (Boulder County, Colorado, USA) / 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) 33
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/46766598282.html" target="_blank"><img src="http://farm8.static.flickr.com/7867/46766598282_8d9e3e9edf_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) 33 / James St. John</span>

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Wizard Island Cinder Cone (Holocene, ~7.2 ka; 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/41151791175.html" target="_blank"><img src="http://farm1.static.flickr.com/961/41151791175_6e2c0bf570_m.jpg" alt="" /></a><br />Wizard Island Cinder Cone (Holocene, ~7.2 ka; Crater Lake Caldera, Oregon, USA) 16 / James St. John</span>

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Blairmorite (porphyritic analcime phonolite) (Crowsnest Volcanics, mid-Cretaceous, 100 Ma; near Blairmore, Alberta, Canada) 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/15004506185.html" target="_blank"><img src="http://farm4.static.flickr.com/3911/15004506185_2fe66df7bd_m.jpg" alt="" /></a><br />Blairmorite (porphyritic analcime phonolite) (Crowsnest Volcanics, mid-Cretaceous, 100 Ma; near Blairmore, Alberta, Canada) 1 / 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) 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/21255353459.html" target="_blank"><img src="http://farm6.static.flickr.com/5740/21255353459_8b5f77c618_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) 12 / James St. John</span>

サイズ変更など

Crater Lake Caldera (Oregon, USA) 138
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/40238511723.html" target="_blank"><img src="http://farm8.static.flickr.com/7909/40238511723_8ff92cde00_m.jpg" alt="" /></a><br />Crater Lake Caldera (Oregon, USA) 138 / James St. John</span>

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Wizard Island Cinder Cone (Holocene, ~7.2 ka; 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/28154411288.html" target="_blank"><img src="http://farm1.static.flickr.com/908/28154411288_338f9a1cde_m.jpg" alt="" /></a><br />Wizard Island Cinder Cone (Holocene, ~7.2 ka; Crater Lake Caldera, Oregon, USA) 12 / James St. John</span>

サイズ変更など

Wizard Island Cinder Cone (Holocene, ~7.2 ka; Crater Lake Caldera, Oregon, 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/28178870898.html" target="_blank"><img src="http://farm1.static.flickr.com/972/28178870898_556823ebb1_m.jpg" alt="" /></a><br />Wizard Island Cinder Cone (Holocene, ~7.2 ka; Crater Lake Caldera, Oregon, USA) 19 / James St. John</span>

サイズ変更など

Wizard Island Cinder Cone (Holocene, ~7.2 ka; Crater Lake Caldera, Oregon, USA) 34
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/46403509364.html" target="_blank"><img src="http://farm8.static.flickr.com/7887/46403509364_3514e2fc33_m.jpg" alt="" /></a><br />Wizard Island Cinder Cone (Holocene, ~7.2 ka; Crater Lake Caldera, Oregon, USA) 34 / 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) 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/37575379812.html" target="_blank"><img src="http://farm5.static.flickr.com/4497/37575379812_70ee3929d3_m.jpg" alt="" /></a><br />Chaos Crags volcanic domes & Chaos Jumbles Landslide (Holocene; Lassen Volcano National Park, California, USA) 2 / 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) 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/42071504591.html" target="_blank"><img src="http://farm1.static.flickr.com/977/42071504591_c5fcdb734e_m.jpg" alt="" /></a><br />Altered andesite (Phantom Cone Andesite, Middle Pleistocene, 346-403 ka; Phantom Ship Island, Crater Lake Caldera, Oregon, USA) 7 / 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) 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/41171477845.html" target="_blank"><img src="http://farm1.static.flickr.com/945/41171477845_4f93657399_m.jpg" alt="" /></a><br />Altered andesite (Phantom Cone Andesite, Middle Pleistocene, 346-403 ka; Phantom Ship Island, Crater Lake Caldera, Oregon, 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) 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/36865367864.html" target="_blank"><img src="http://farm5.static.flickr.com/4455/36865367864_e9f94b3626_m.jpg" alt="" /></a><br />Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 14 / 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) 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/30779535653.html" target="_blank"><img src="http://farm6.static.flickr.com/5589/30779535653_e15a94ba58_m.jpg" alt="" /></a><br />Garnetiferous metanorthosite (Marcy Anorthosite, Mesoproterozoic, 1155 Ma; Rt. 73 roadcut near Chapel Pond, Adirondack Mountains, New York State, USA) 1 / James St. John</span>

サイズ変更など

Porphyritic melarhyolite (Shut-In Mountain Rhyolite, Mesoproterozoic, 1.3-1.5 Ga; Rocky Falls, near the town of Winona, Missouri, 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/46537217964.html" target="_blank"><img src="http://farm8.static.flickr.com/7802/46537217964_90ba991419_m.jpg" alt="" /></a><br />Porphyritic melarhyolite (Shut-In Mountain Rhyolite, Mesoproterozoic, 1.3-1.5 Ga; Rocky Falls, near the town of Winona, Missouri, USA) / James St. John</span>

サイズ変更など

Hornblende andesite (Mount Shasta, 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/39675099870.html" target="_blank"><img src="http://farm1.static.flickr.com/794/39675099870_8c906ff0ee_m.jpg" alt="" /></a><br />Hornblende andesite (Mount Shasta, California, USA) 1 / James St. John</span>

サイズ変更など

Red Cone (Late Pleistocene cinder cone with basaltic andesite, 35-36 ka; northwest of Crater Lake Caldera, Oregon, 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/40844766865.html" target="_blank"><img src="http://farm1.static.flickr.com/872/40844766865_ff7601c769_m.jpg" alt="" /></a><br />Red Cone (Late Pleistocene cinder cone with basaltic andesite, 35-36 ka; northwest of Crater Lake Caldera, Oregon, USA) 7 / James St. John</span>

サイズ変更など

Red Cone (Late Pleistocene cinder cone with basaltic andesite, 35-36 ka; northwest of 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/41703054872.html" target="_blank"><img src="http://farm1.static.flickr.com/865/41703054872_11126f4dff_m.jpg" alt="" /></a><br />Red Cone (Late Pleistocene cinder cone with basaltic andesite, 35-36 ka; northwest of Crater Lake Caldera, 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) 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/37318131900.html" target="_blank"><img src="http://farm5.static.flickr.com/4475/37318131900_48d1c37fab_m.jpg" alt="" /></a><br />Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 60 / James St. John</span>

サイズ変更など

Porphyritic granite
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/8475805063.html" target="_blank"><img src="http://farm9.static.flickr.com/8105/8475805063_739013c84f_m.jpg" alt="" /></a><br />Porphyritic granite / James St. John</span>

サイズ変更など

Sunstone (Tertiary; Spectrum Mine, 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/51661597980.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51661597980_e81f0f8a86_m.jpg" alt="" /></a><br />Sunstone (Tertiary; Spectrum Mine, Oregon, USA) 10 / James St. John</span>

サイズ変更など

Mount Scott Volcano (Crater Lake National Park, 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/42030064801.html" target="_blank"><img src="http://farm1.static.flickr.com/964/42030064801_a7b42cbf5f_m.jpg" alt="" /></a><br />Mount Scott Volcano (Crater Lake National Park, Oregon, USA) 6 / James St. John</span>

サイズ変更など

Mount Scott Volcano (Crater Lake National Park, 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/41147900355.html" target="_blank"><img src="http://farm1.static.flickr.com/950/41147900355_24e41d5397_m.jpg" alt="" /></a><br />Mount Scott Volcano (Crater Lake National Park, Oregon, USA) 11 / 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) 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/22990739259.html" target="_blank"><img src="http://farm6.static.flickr.com/5786/22990739259_73726399e3_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) 5 / James St. John</span>

サイズ変更など

"Imperial Porphyry" - porphyritic metadacite to porphyritic meta-andesite (Dokhan Volcanics, Neoproterozoic, ~593-602 Ma; Mons Porphyrites, Red Sea Mountains, Egypt) 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/29980457784.html" target="_blank"><img src="http://farm6.static.flickr.com/5669/29980457784_fde34c3182_m.jpg" alt="" /></a><br />"Imperial Porphyry" - porphyritic metadacite to porphyritic meta-andesite (Dokhan Volcanics, Neoproterozoic, ~593-602 Ma; Mons Porphyrites, Red Sea Mountains, Egypt) 4 / James St. John</span>

サイズ変更など

Mount Scott Volcano (Crater Lake National Park, 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/41380737384.html" target="_blank"><img src="http://farm1.static.flickr.com/959/41380737384_b6835e6e2b_m.jpg" alt="" /></a><br />Mount Scott Volcano (Crater Lake National Park, Oregon, USA) 13 / James St. John</span>

サイズ変更など

Porphyritic latite (San Juan Volcanic Field, Tertiary; Lake City, Colorado, 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/27612958568.html" target="_blank"><img src="http://farm1.static.flickr.com/870/27612958568_70f69107f0_m.jpg" alt="" /></a><br />Porphyritic latite (San Juan Volcanic Field, Tertiary; Lake City, Colorado, USA) / James St. John</span>

サイズ変更など

Porphyritic diabase (Cape Ann, Massachusetts, 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/51619589092.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51619589092_abc6658141_m.jpg" alt="" /></a><br />Porphyritic diabase (Cape Ann, Massachusetts, USA) 4 / 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) 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/39844297003.html" target="_blank"><img src="http://farm5.static.flickr.com/4863/39844297003_b44b2a67a2_m.jpg" alt="" /></a><br />Aphyric & partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 13 / 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) 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/36944645323.html" target="_blank"><img src="http://farm5.static.flickr.com/4461/36944645323_738d1f5dac_m.jpg" alt="" /></a><br />Chaos Crags volcanic domes & Chaos Jumbles Landslide (Holocene; Lassen Volcano National Park, California, 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) 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/21255412429.html" target="_blank"><img src="http://farm6.static.flickr.com/5728/21255412429_21f0288af7_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) 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) 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/37527072576.html" target="_blank"><img src="http://farm5.static.flickr.com/4505/37527072576_684e9dbfd4_m.jpg" alt="" /></a><br />Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, 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) 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/41281387624.html" target="_blank"><img src="http://farm1.static.flickr.com/826/41281387624_651e6cdd20_m.jpg" alt="" /></a><br />Wizard Island Cinder Cone (Holocene, ~7.2 ka; Crater Lake Caldera, Oregon, USA) 7 / 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) 61
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/36866437004.html" target="_blank"><img src="http://farm5.static.flickr.com/4503/36866437004_3f34127113_m.jpg" alt="" /></a><br />Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 61 / James St. John</span>

サイズ変更など

Scoria (Middle Pleistocene, 670 ka; Black Rock Volcano, Millard County, Utah, 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/31596048441.html" target="_blank"><img src="http://farm1.static.flickr.com/462/31596048441_a996197711_m.jpg" alt="" /></a><br />Scoria (Middle Pleistocene, 670 ka; Black Rock Volcano, Millard County, Utah, USA) 2 / James St. John</span>

サイズ変更など

Llanite (porphyritic melarhyolite) (Mesoproterozoic, 1.106 Ga; roadcut ~9 miles north of Llano, Texas, 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/14838249808.html" target="_blank"><img src="http://farm4.static.flickr.com/3843/14838249808_2bbf06aa9a_m.jpg" alt="" /></a><br />Llanite (porphyritic melarhyolite) (Mesoproterozoic, 1.106 Ga; roadcut ~9 miles north of Llano, Texas, USA) 1 / James St. John</span>

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Deformed flow layering in rhyolitic rheoignimbrite (Palisade Rhyolite, North Shore Volcanic Group, Mesoproterozoic, 1096-1097 Ma; Rt. 1 roadcut just north of Ilgen City, 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/23358469265.html" target="_blank"><img src="http://farm6.static.flickr.com/5757/23358469265_21eb2f99e3_m.jpg" alt="" /></a><br />Deformed flow layering in rhyolitic rheoignimbrite (Palisade Rhyolite, North Shore Volcanic Group, Mesoproterozoic, 1096-1097 Ma; Rt. 1 roadcut just north of Ilgen City, Minnesota, USA) 2 / 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) 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/51021577236.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51021577236_a06894e001_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) 19 / James St. John</span>

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Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 63
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/36866427694.html" target="_blank"><img src="http://farm5.static.flickr.com/4506/36866427694_7d84c5e5d0_m.jpg" alt="" /></a><br />Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 63 / James St. John</span>

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Pilot Butte (Pliocene madupite lamproite volcanic center in the Leucite Hills, 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/48927571506.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48927571506_d15bd572dc_m.jpg" alt="" /></a><br />Pilot Butte (Pliocene madupite lamproite volcanic center in the Leucite Hills, Wyoming, USA) 4 / 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) 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/28198923368.html" target="_blank"><img src="http://farm1.static.flickr.com/829/28198923368_1bc9c351bf_m.jpg" alt="" /></a><br />Altered andesite (Phantom Cone Andesite, Middle Pleistocene, 346-403 ka; Phantom Ship Island, Crater Lake Caldera, Oregon, USA) 3 / James St. John</span>

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Chaos Crags volcanic domes & Chaos Jumbles Landslide (Holocene; Lassen Volcano National Park, California, 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/37575339202.html" target="_blank"><img src="http://farm5.static.flickr.com/4501/37575339202_d07c869211_m.jpg" alt="" /></a><br />Chaos Crags volcanic domes & Chaos Jumbles Landslide (Holocene; Lassen Volcano National Park, California, USA) 5 / James St. John</span>

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Quenched blobs in 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/37306407440.html" target="_blank"><img src="http://farm5.static.flickr.com/4476/37306407440_dffd3a3842_m.jpg" alt="" /></a><br />Quenched blobs in 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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Feldspar phenocrysts in Bumbo Latite
by Dietmar Down Under

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/31647250015.html" target="_blank"><img src="http://farm1.static.flickr.com/769/31647250015_0189cdeb4f_m.jpg" alt="" /></a><br />Feldspar phenocrysts in Bumbo Latite / Dietmar Down Under</span>

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Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 52
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/36866113674.html" target="_blank"><img src="http://farm5.static.flickr.com/4467/36866113674_034a8c98dd_m.jpg" alt="" /></a><br />Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 52 / James St. John</span>

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Rhyolite (Palisade Rhyolite, North Shore Volcanic Group, Mesoproterozoic, 1096-1097 Ma; Rt. 1 roadcut just north of Ilgen City, Minnesota, 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/23062785790.html" target="_blank"><img src="http://farm6.static.flickr.com/5703/23062785790_b32660067c_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) 10 / James St. John</span>

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Camptonite lamprophyre (Early Jurassic, ~194 Ma; Campton Falls, Grafton County, New Hampshire, 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/40714281504.html" target="_blank"><img src="http://farm1.static.flickr.com/820/40714281504_8b2075833c_m.jpg" alt="" /></a><br />Camptonite lamprophyre (Early Jurassic, ~194 Ma; Campton Falls, Grafton County, New Hampshire, USA) / James St. John</span>

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Western Weighing & Inspection Bureau # 910 test weight car 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/22191120763.html" target="_blank"><img src="http://farm1.static.flickr.com/771/22191120763_2eb3691414_m.jpg" alt="" /></a><br />Western Weighing & Inspection Bureau # 910 test weight car 1 / James St. John</span>

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Mount Scott Volcano (Crater Lake National Park, 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/40222405890.html" target="_blank"><img src="http://farm1.static.flickr.com/824/40222405890_29b48e3eac_m.jpg" alt="" /></a><br />Mount Scott Volcano (Crater Lake National Park, Oregon, USA) 5 / 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) 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/45893662945.html" target="_blank"><img src="http://farm8.static.flickr.com/7865/45893662945_c556d58b1c_m.jpg" alt="" /></a><br />Aphyric & 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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Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 58
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/37576671851.html" target="_blank"><img src="http://farm5.static.flickr.com/4513/37576671851_e3aab266cf_m.jpg" alt="" /></a><br />Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 58 / 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) 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/50960635436.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50960635436_e1b0156839_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) 10 / James St. John</span>

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Dome C and Dome E of Chaos Crags volcanic domes & Chaos Jumbles Landslide (Holocene; Lassen Volcano National Park, California, 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/36897016214.html" target="_blank"><img src="http://farm5.static.flickr.com/4481/36897016214_4df6341d89_m.jpg" alt="" /></a><br />Dome C and Dome E of Chaos Crags volcanic domes & Chaos Jumbles Landslide (Holocene; Lassen Volcano National Park, California, USA) / James St. John</span>

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