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Columnar-jointed rhyolite (Palisade Rhyolite, North Shore Volcanic Group, Mesoproterozoic, 1096-1097 Ma; Palisade Head, northeastern Minnesota, USA) 3
Columnar-jointed rhyolite (Palisade Rhyolite, North Shore Volcanic Group, Mesoproterozoic, 1096-1097 Ma; Palisade Head, northeastern Minnesota, USA) 3
by James St. John

クリエイティブ・コモンズ 表示 2.1

サイズ変更など
Hornblende andesite (Mount Shasta, California, USA) 2
Hornblende andesite (Mount Shasta, California, USA) 2
by James St. John

クリエイティブ・コモンズ 表示 2.1

サイズ変更など
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) 1
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) 1
by James St. John

クリエイティブ・コモンズ 表示 2.1

サイズ変更など

Chaos Crags volcanic domes & Chaos Jumbles Landslide (Holocene; Lassen Volcano National Park, California, USA) 8
Chaos Crags volcanic domes & Chaos Jumbles Landslide (Holocene; 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

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) 4
Red Cone (Late Pleistocene cinder cone with basaltic andesite, 35-36 ka; northwest of 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

サイズ変更など
Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 45
Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 45
by James St. John

クリエイティブ・コモンズ 表示 2.1

サイズ変更など

Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 5
Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, 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

サイズ変更など
Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 55
Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 55
by James St. John

クリエイティブ・コモンズ 表示 2.1

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) 8
Vesicular andesite (Upper Pliocene, 1.9 Ma; Sierra Grande Shield Volcano, Raton-Clayton Volcanic Field, New Mexico, USA) 8
by James St. John

クリエイティブ・コモンズ 表示 2.1

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) 7
Partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 7
by James St. John

クリエイティブ・コモンズ 表示 2.1

サイズ変更など
Llao Rock (Crater Lake Caldera, Oregon, USA) 26
Llao Rock (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

サイズ変更など
Wizard Island Cinder Cone (Holocene, ~7.2 ka; Crater Lake Caldera, Oregon, USA) 8
Wizard Island Cinder Cone (Holocene, ~7.2 ka; 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

サイズ変更など

Pilot Butte (Pliocene madupite lamproite volcanic center in the Leucite Hills, Wyoming, USA) 2
Pilot Butte (Pliocene madupite lamproite volcanic center in the Leucite Hills, Wyoming, USA) 2
by James St. John

クリエイティブ・コモンズ 表示 2.1

サイズ変更など
Black porphyritic glassy dacite from the 1915 eruption of Mt. Lassen (Devastated Area, Lassen Volcano National Park, Cascade Range, northeastern California, USA)
Black porphyritic glassy dacite from the 1915 eruption of Mt. Lassen (Devastated Area, Lassen Volcano National Park, Cascade Range, northeastern California, USA)
by James St. John

クリエイティブ・コモンズ 表示 2.1

サイズ変更など
Kimberlite (Gates-Adah Kimberlite Dike, Early Jurassic; Fayette County, Pennsylvania, USA) 18
Kimberlite (Gates-Adah Kimberlite Dike, Early Jurassic; Fayette County, Pennsylvania, USA) 18
by James St. John

クリエイティブ・コモンズ 表示 2.1

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) 6
Partially devitrified rhyolitic obsidian (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

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) 6
Rhyolite (Palisade Rhyolite, North Shore Volcanic Group, Mesoproterozoic, 1096-1097 Ma; Rt. 1 roadcut just north of Ilgen City, Minnesota, USA) 6
by James St. John

クリエイティブ・コモンズ 表示 2.1

サイズ変更など
Sunstone (Tertiary; Spectrum Mine, Oregon, USA) 5
Sunstone (Tertiary; Spectrum Mine, Oregon, USA) 5
by James St. John

クリエイティブ・コモンズ 表示 2.1

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) 3
Rhyolite (Palisade Rhyolite, North Shore Volcanic Group, Mesoproterozoic, 1096-1097 Ma; Rt. 1 roadcut just north of Ilgen City, Minnesota, USA) 3
by James St. John

クリエイティブ・コモンズ 表示 2.1

サイズ変更など
Wizard Island Cinder Cone (Holocene, ~7.2 ka; Crater Lake Caldera, Oregon, USA) 31
Wizard Island Cinder Cone (Holocene, ~7.2 ka; Crater Lake Caldera, Oregon, USA) 31
by James St. John

クリエイティブ・コモンズ 表示 2.1

サイズ変更など
Llao Rock (Crater Lake Caldera, Oregon, USA) 13
Llao Rock (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

サイズ変更など

Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 3
Black porphyritic dacite (upper Holocene, 14 May 1915; 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

サイズ変更など
Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 57
Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 57
by James St. John

クリエイティブ・コモンズ 表示 2.1

サイズ変更など
Sandstone-phonolite intrusive contact (Buck Ranch, Highwood Mountains, Montana, USA) 2
Sandstone-phonolite intrusive contact (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

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) 7
Rhyolite (Palisade Rhyolite, North Shore Volcanic Group, Mesoproterozoic, 1096-1097 Ma; Rt. 1 roadcut just north of Ilgen City, Minnesota, USA) 7
by James St. John

クリエイティブ・コモンズ 表示 2.1

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) 8
Partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 8
by James St. John

クリエイティブ・コモンズ 表示 2.1

サイズ変更など
Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 34
Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 34
by James St. John

クリエイティブ・コモンズ 表示 2.1

サイズ変更など

Wyomingite (Lower Pleistocene, 0.95 Ma; quarry on volcanic cone on Zirkel Mesa, Leucite Hills Volcanic Province, Wyoming, USA) 2
Wyomingite (Lower Pleistocene, 0.95 Ma; quarry on volcanic cone on Zirkel Mesa, Leucite Hills Volcanic Province, Wyoming, USA) 2
by James St. John

クリエイティブ・コモンズ 表示 2.1

サイズ変更など
Quenched blobs in pinkish-reddish porphyritic dacite (Upper Pleistocene, 27 ka; Devastated Area, Lassen Volcano National Park, California, USA) 4
Quenched blobs in 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

サイズ変更など
Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 48
Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 48
by James St. John

クリエイティブ・コモンズ 表示 2.1

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) 2
Red Cone (Late Pleistocene cinder cone with basaltic andesite, 35-36 ka; northwest 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

サイズ変更など
Mount Scott Volcano (Crater Lake National Park, Oregon, USA) 9
Mount Scott Volcano (Crater Lake National Park, Oregon, USA) 9
by James St. John

クリエイティブ・コモンズ 表示 2.1

サイズ変更など
Wizard Island Cinder Cone (Holocene, ~7.2 ka; Crater Lake Caldera, Oregon, USA) 9
Wizard Island Cinder Cone (Holocene, ~7.2 ka; Crater Lake Caldera, Oregon, USA) 9
by James St. John

クリエイティブ・コモンズ 表示 2.1

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) 13
Rhyolite (Palisade Rhyolite, North Shore Volcanic Group, Mesoproterozoic, 1096-1097 Ma; Rt. 1 roadcut just north of Ilgen City, Minnesota, USA) 13
by James St. John

クリエイティブ・コモンズ 表示 2.1

サイズ変更など
Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 56
Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 56
by James St. John

クリエイティブ・コモンズ 表示 2.1

サイズ変更など
Scoriaceous lava (July-August 2001 eruption of Mt. Etna, eastern Sicily)
Scoriaceous lava (July-August 2001 eruption of Mt. Etna, eastern Sicily)
by James St. John

クリエイティブ・コモンズ 表示 2.1

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) 3
Red Cone (Late Pleistocene cinder cone with basaltic andesite, 35-36 ka; northwest of 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

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) 2
Quenched blob in 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

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) 11
Partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 11
by James St. John

クリエイティブ・コモンズ 表示 2.1

サイズ変更など

Aphyric rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 1
Aphyric 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

サイズ変更など
Black porphyritic metarhyolite (Utley Rhyolite, Paleoproterozoic, 1765 Ma; Utley Rhyolite Quarry, near Green Lake, Wisconsin, USA) 1
Black porphyritic metarhyolite (Utley Rhyolite, Paleoproterozoic, 1765 Ma; Utley Rhyolite Quarry, near Green Lake, Wisconsin, USA) 1
by James St. John

クリエイティブ・コモンズ 表示 2.1

サイズ変更など
Partially devitrified rhyolitic obsidian with lithophysae (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 3
Partially devitrified rhyolitic obsidian with lithophysae (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

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) 9
Partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 9
by James St. John

クリエイティブ・コモンズ 表示 2.1

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) 12
Rhyolite (Palisade Rhyolite, North Shore Volcanic Group, Mesoproterozoic, 1096-1097 Ma; Rt. 1 roadcut just north of Ilgen City, Minnesota, USA) 12
by James St. John

クリエイティブ・コモンズ 表示 2.1

サイズ変更など
Quenched blobs in pinkish-reddish porphyritic dacite (Upper Pleistocene, 27 ka; Devastated Area, Lassen Volcano National Park, California, USA) 6
Quenched blobs in pinkish-reddish porphyritic dacite (Upper Pleistocene, 27 ka; Devastated Area, Lassen Volcano National Park, California, USA) 6
by James St. John

クリエイティブ・コモンズ 表示 2.1

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) 1
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

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
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

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) 27
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

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
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

サイズ変更など
Denver & Rio Grande Western Railroad # 683 steam locomotive (Baldwin C-28 2-8-0) 4
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

サイズ変更など
Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 25
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

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
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

サイズ変更など
Mount Scott Volcano (Crater Lake National Park, Oregon, USA) 10
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

サイズ変更など
Partially devitrified rhyolitic obsidian with lithophysae (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 1
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

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
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

サイズ変更など
Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 54
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

サイズ変更など
Pilot Butte (Pliocene madupite lamproite volcanic center in the Leucite Hills, Wyoming, USA) 3
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

サイズ変更など

Trachyte obsidian (Quaternary; Ol Doinyo Nyukie Volcano, Kenya) 2
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

サイズ変更など
Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 32
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

サイズ変更など
Kimberlite (Snegurochka Pipe, Late Devonian; Arkhangelsk Region, Russia) 7
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

サイズ変更など


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