phenocryst

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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

Llao Rock (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/27135641717.html" target="_blank"><img src="http://farm1.static.flickr.com/979/27135641717_f2c6518b50_m.jpg" alt="" /></a><br />Llao Rock (Crater Lake Caldera, Oregon, USA) 8 / James St. John</span>

サイズ変更など

Crater Lake Caldera (Oregon, USA) 95
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/47115447371.html" target="_blank"><img src="http://farm8.static.flickr.com/7822/47115447371_36ee176f79_m.jpg" alt="" /></a><br />Crater Lake Caldera (Oregon, USA) 95 / 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) 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/51020846873.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51020846873_4806a995b8_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) 11 / 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) 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/39844278833.html" target="_blank"><img src="http://farm5.static.flickr.com/4807/39844278833_a67310a39c_m.jpg" alt="" /></a><br />Aphyric & partially devitrified rhyolitic obsidian (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

Rhyodacite vitrophyre (Llao Rock Rhyodacite, Holocene, ~7.8-7.9 ka; roadcut near Llao Rock, margin of Crater Lake Caldera, Oregon, USA) 56
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/41739233111.html" target="_blank"><img src="http://farm1.static.flickr.com/868/41739233111_d6780e3c58_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) 56 / James St. John</span>

サイズ変更など

Basalt (McCartys Flow, Holocene, ~2.4 to 3.9 ka; southeast of Grants, 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/52771290656.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52771290656_0440ae26c7_m.jpg" alt="" /></a><br />Basalt (McCartys Flow, Holocene, ~2.4 to 3.9 ka; southeast of Grants, New Mexico, USA) 19 / 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) 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/21416048626.html" target="_blank"><img src="http://farm1.static.flickr.com/736/21416048626_651346a4b7_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) 9 / James St. John</span>

サイズ変更など

Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 45
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/47926998468.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/47926998468_c4377fd21c_m.jpg" alt="" /></a><br />Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 45 / 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) 36
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/52326939763.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52326939763_61fa29aa16_m.jpg" alt="" /></a><br />Hot Creek Rhyolite Flow (Pleistocene, 288 or 333 ka; Hot Creek Gorge, Long Valley Caldera, California, USA) 36 / James St. John</span>

サイズ変更など

Pilot Butte (Pliocene madupite lamproite volcanic center in the Leucite Hills, 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/48931661598.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48931661598_a1437ba3e0_m.jpg" alt="" /></a><br />Pilot Butte (Pliocene madupite lamproite volcanic center in the Leucite Hills, Wyoming, USA) 20 / James St. John</span>

サイズ変更など

Obsidian & devitrified obsidian gravel (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

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/31875658407.html" target="_blank"><img src="http://farm8.static.flickr.com/7918/31875658407_8ee2b5299c_m.jpg" alt="" /></a><br />Obsidian & devitrified obsidian gravel (Obsidian Cliff, Yellowstone, Wyoming, USA) 7 / James St. John</span>

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) 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/49992029933.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/49992029933_235144e624_m.jpg" alt="" /></a><br />Wyomingite (Lower Pleistocene, 0.95 Ma; quarry on volcanic cone on Zirkel Mesa, Leucite Hills Volcanic Province, Wyoming, USA) 24 / James St. John</span>

サイズ変更など

Vesicular lava (July-August 2001 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/51023509338.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51023509338_8ae18828d8_m.jpg" alt="" /></a><br />Vesicular lava (July-August 2001 eruption of Mt. Etna, eastern Sicily) 2 / James St. John</span>

サイズ変更など

Cartier Granite (Neoarchean; 2.642 Ga; Crab Lake South roadcut, south-southeast of Cartier, Ontario, Canada) 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/46817976855.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/46817976855_690208bc32_m.jpg" alt="" /></a><br />Cartier Granite (Neoarchean; 2.642 Ga; Crab Lake South roadcut, south-southeast of Cartier, Ontario, Canada) 6 / James St. John</span>

サイズ変更など

Kimberlite (Snegurochka Pipe, Late Devonian; Arkhangelsk Region, Russia) 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/50600113102.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50600113102_e9c15c4772_m.jpg" alt="" /></a><br />Kimberlite (Snegurochka Pipe, Late Devonian; Arkhangelsk Region, Russia) 2 / James St. John</span>

サイズ変更など

Lugarite (Lugar Sill, Early Permian, 288 Ma; near Lugar, Ayrshire, Scotland) 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/50595623762.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50595623762_29ee4a3a5b_m.jpg" alt="" /></a><br />Lugarite (Lugar Sill, Early Permian, 288 Ma; near Lugar, Ayrshire, Scotland) 13 / 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) 37
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/37544101952.html" target="_blank"><img src="http://farm5.static.flickr.com/4495/37544101952_214c5a836e_m.jpg" alt="" /></a><br />Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 37 / James St. John</span>

サイズ変更など

Llao Rock (Crater Lake Caldera, Oregon, 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/28154347508.html" target="_blank"><img src="http://farm1.static.flickr.com/966/28154347508_cefba4f591_m.jpg" alt="" /></a><br />Llao Rock (Crater Lake Caldera, Oregon, USA) 22 / James St. John</span>

サイズ変更など

Cartier Granite (Neoarchean; 2.642 Ga; Crab Lake South roadcut, south-southeast of Cartier, Ontario, Canada) 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/47734650301.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/47734650301_ee8835d5b7_m.jpg" alt="" /></a><br />Cartier Granite (Neoarchean; 2.642 Ga; Crab Lake South roadcut, south-southeast of Cartier, Ontario, Canada) 3 / 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) 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/39931731280.html" target="_blank"><img src="http://farm1.static.flickr.com/964/39931731280_67a54928e7_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) 61 / 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) 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/21416041126.html" target="_blank"><img src="http://farm6.static.flickr.com/5776/21416041126_7b9d21e578_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) 10 / James St. John</span>

サイズ変更など

Actinolite xenolith & sandorite lamprophyre (Sandor Dike, Neoarchean, 2.703 Ga; Route 17 roadcut northeast of Wasp Lake & north of Wawa, Ontario, Canada) 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/48343254447.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48343254447_17de4f961b_m.jpg" alt="" /></a><br />Actinolite xenolith & sandorite lamprophyre (Sandor Dike, Neoarchean, 2.703 Ga; Route 17 roadcut northeast of Wasp Lake & north of Wawa, Ontario, Canada) 22 / James St. John</span>

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) 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/49978925358.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/49978925358_fb4fa74f70_m.jpg" alt="" /></a><br />Wyomingite (Lower Pleistocene, 0.95 Ma; quarry on volcanic cone on Zirkel Mesa, Leucite Hills Volcanic Province, Wyoming, USA) 11 / James St. John</span>

サイズ変更など

Actinolite xenolith in sandorite lamprophyre (Sandor Dike, Neoarchean, 2.703 Ga; Route 17 roadcut northeast of Wasp Lake & north of Wawa, Ontario, Canada) 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/48342621891.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48342621891_1a616df395_m.jpg" alt="" /></a><br />Actinolite xenolith in sandorite lamprophyre (Sandor Dike, Neoarchean, 2.703 Ga; Route 17 roadcut northeast of Wasp Lake & north of Wawa, Ontario, Canada) 3 / James St. John</span>

サイズ変更など

Basalt (McCartys Flow, Holocene, ~2.4 to 3.9 ka; southeast of Grants, New Mexico, 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/52770761092.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52770761092_b4ebc40f00_m.jpg" alt="" /></a><br />Basalt (McCartys Flow, Holocene, ~2.4 to 3.9 ka; southeast of Grants, New Mexico, USA) 7 / James St. John</span>

サイズ変更など

Crater Lake Caldera (Oregon, USA) 94
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/46391724144.html" target="_blank"><img src="http://farm8.static.flickr.com/7856/46391724144_78bb008154_m.jpg" alt="" /></a><br />Crater Lake Caldera (Oregon, USA) 94 / 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) 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/21442317655.html" target="_blank"><img src="http://farm1.static.flickr.com/601/21442317655_58d37299d0_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) 5 / James St. John</span>

サイズ変更など

Kimberlite (Snegurochka Pipe, Late Devonian; Arkhangelsk Region, Russia) 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/50599995176.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50599995176_97511728a1_m.jpg" alt="" /></a><br />Kimberlite (Snegurochka Pipe, Late Devonian; Arkhangelsk Region, Russia) 5 / 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) 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/32933796238.html" target="_blank"><img src="http://farm5.static.flickr.com/4816/32933796238_190d03c020_m.jpg" alt="" /></a><br />Partially devitrified rhyolitic obsidian (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

Rhyodacite vitrophyre (Llao Rock Rhyodacite, Holocene, ~7.8-7.9 ka; roadcut near Llao Rock, margin of Crater Lake Caldera, Oregon, USA) 42
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/41020848724.html" target="_blank"><img src="http://farm1.static.flickr.com/867/41020848724_e74b755779_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) 42 / 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) 53
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/41021519744.html" target="_blank"><img src="http://farm1.static.flickr.com/982/41021519744_86cdbfd362_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) 53 / James St. John</span>

サイズ変更など

Pilot Butte (Pliocene madupite lamproite volcanic center in the Leucite Hills, Wyoming, USA) 21
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/48931659663.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48931659663_8aab5e169d_m.jpg" alt="" /></a><br />Pilot Butte (Pliocene madupite lamproite volcanic center in the Leucite Hills, Wyoming, USA) 21 / James St. John</span>

サイズ変更など

Obsidian & devitrified obsidian gravel (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/46092075524.html" target="_blank"><img src="http://farm8.static.flickr.com/7811/46092075524_43d86d8b2a_m.jpg" alt="" /></a><br />Obsidian & devitrified obsidian gravel (Obsidian Cliff, Yellowstone, Wyoming, USA) 6 / James St. John</span>

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) 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/49992553011.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/49992553011_70960b8dee_m.jpg" alt="" /></a><br />Wyomingite (Lower Pleistocene, 0.95 Ma; quarry on volcanic cone on Zirkel Mesa, Leucite Hills Volcanic Province, Wyoming, USA) 27 / James St. John</span>

サイズ変更など

Basalt (McCartys Flow, Holocene, ~2.4 to 3.9 ka; southeast of Grants, 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/52771782183.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52771782183_7e5c00b4f6_m.jpg" alt="" /></a><br />Basalt (McCartys Flow, Holocene, ~2.4 to 3.9 ka; southeast of Grants, New Mexico, USA) 10 / 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) 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/39923113870.html" target="_blank"><img src="http://farm1.static.flickr.com/911/39923113870_31d8c8583f_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) 3 / James St. John</span>

サイズ変更など

Cathedral Peak Granodiorite (Late Cretaceous, 86-88 Ma; Yosemite 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/50039631472.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50039631472_e90e024437_m.jpg" alt="" /></a><br />Cathedral Peak Granodiorite (Late Cretaceous, 86-88 Ma; Yosemite National Park, California, USA) / James St. John</span>

サイズ変更など

Sedimentary xenolith in madupite lamproite (Late Pliocene, 3 Ma; Pilot Butte volcanic center, Leucite Hills, 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/48931927352.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48931927352_e24d17b9c6_m.jpg" alt="" /></a><br />Sedimentary xenolith in madupite lamproite (Late Pliocene, 3 Ma; Pilot Butte volcanic center, Leucite Hills, Wyoming, USA) 2 / James St. John</span>

サイズ変更など

Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 44
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/47927004711.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/47927004711_160294d970_m.jpg" alt="" /></a><br />Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 44 / James St. John</span>

サイズ変更など

Scoria (Middle Pleistocene, 670 ka; Black Rock Volcano, Millard County, Utah, 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/31338716200.html" target="_blank"><img src="http://farm1.static.flickr.com/455/31338716200_ed56fd7cc5_m.jpg" alt="" /></a><br />Scoria (Middle Pleistocene, 670 ka; Black Rock Volcano, Millard County, Utah, USA) 1 / James St. John</span>

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Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, 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/37527019216.html" target="_blank"><img src="http://farm5.static.flickr.com/4483/37527019216_865f9e15d6_m.jpg" alt="" /></a><br />Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 12 / 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) 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/49979398551.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/49979398551_44ed182242_m.jpg" alt="" /></a><br />Wyomingite (Lower Pleistocene, 0.95 Ma; quarry on volcanic cone on Zirkel Mesa, Leucite Hills Volcanic Province, Wyoming, USA) 6 / James St. John</span>

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Actinolite xenolith in sandorite lamprophyre (Sandor Dike, Neoarchean, 2.703 Ga; Route 17 roadcut northeast of Wasp Lake & north of Wawa, Ontario, Canada) 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/48342593466.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48342593466_b92b1318eb_m.jpg" alt="" /></a><br />Actinolite xenolith in sandorite lamprophyre (Sandor Dike, Neoarchean, 2.703 Ga; Route 17 roadcut northeast of Wasp Lake & north of Wawa, Ontario, Canada) 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) 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/39844345913.html" target="_blank"><img src="http://farm8.static.flickr.com/7801/39844345913_6e37687a72_m.jpg" alt="" /></a><br />Aphyric & partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 6 / James St. John</span>

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Sedimentary xenolith in madupite lamproite (Late Pliocene, 3 Ma; Pilot Butte volcanic center, Leucite Hills, 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/48931731626.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48931731626_8dd49632d7_m.jpg" alt="" /></a><br />Sedimentary xenolith in madupite lamproite (Late Pliocene, 3 Ma; Pilot Butte volcanic center, Leucite Hills, Wyoming, USA) 1 / James St. John</span>

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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/41285602944.html" target="_blank"><img src="http://farm1.static.flickr.com/950/41285602944_0c5150e74b_m.jpg" alt="" /></a><br />Llao Rock (Crater Lake Caldera, Oregon, USA) 4 / James St. John</span>

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Llao Rock (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

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/41960804792.html" target="_blank"><img src="http://farm1.static.flickr.com/943/41960804792_7382daae27_m.jpg" alt="" /></a><br />Llao Rock (Crater Lake Caldera, Oregon, USA) 9 / James St. John</span>

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Pilot Butte (Pliocene madupite lamproite volcanic center in the Leucite Hills, Wyoming, 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/48932197701.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48932197701_0228a2fefa_m.jpg" alt="" /></a><br />Pilot Butte (Pliocene madupite lamproite volcanic center in the Leucite Hills, Wyoming, 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) 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/37527449506.html" target="_blank"><img src="http://farm5.static.flickr.com/4493/37527449506_336ba0697c_m.jpg" alt="" /></a><br />Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 18 / James St. John</span>

サイズ変更など

Actinolite xenolith in sandorite lamprophyre (Sandor Dike, Neoarchean, 2.703 Ga; Route 17 roadcut northeast of Wasp Lake & north of Wawa, Ontario, Canada) 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/48342712757.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48342712757_b1c2ef22b8_m.jpg" alt="" /></a><br />Actinolite xenolith in sandorite lamprophyre (Sandor Dike, Neoarchean, 2.703 Ga; Route 17 roadcut northeast of Wasp Lake & north of Wawa, Ontario, Canada) 10 / James St. John</span>

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Hot Creek Rhyolite Flow (Pleistocene, 288 or 333 ka; Hot Creek Gorge, Long Valley Caldera, California, 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/52327065225.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52327065225_78b1962ba8_m.jpg" alt="" /></a><br />Hot Creek Rhyolite Flow (Pleistocene, 288 or 333 ka; Hot Creek Gorge, Long Valley Caldera, California, USA) 34 / 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) 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/31868072007.html" target="_blank"><img src="http://farm5.static.flickr.com/4813/31868072007_8ea704140f_m.jpg" alt="" /></a><br />Aphyric & partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 11 / James St. John</span>

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Obsidian & devitrified obsidian gravel (Obsidian Cliff, Yellowstone, 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/45902165525.html" target="_blank"><img src="http://farm5.static.flickr.com/4828/45902165525_55ea7b6ff7_m.jpg" alt="" /></a><br />Obsidian & devitrified obsidian gravel (Obsidian Cliff, Yellowstone, Wyoming, USA) 5 / James St. John</span>

サイズ変更など

Porphyritic rhyodacite (Holocene; Chaos Jumbles Landslide, 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/36907322784.html" target="_blank"><img src="http://farm5.static.flickr.com/4490/36907322784_42862cb119_m.jpg" alt="" /></a><br />Porphyritic rhyodacite (Holocene; Chaos Jumbles Landslide, Lassen Volcano National Park, California, USA) 8 / 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) 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/41021617184.html" target="_blank"><img src="http://farm1.static.flickr.com/956/41021617184_d668d15f97_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) 59 / James St. John</span>

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Partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, 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/31875210707.html" target="_blank"><img src="http://farm8.static.flickr.com/7875/31875210707_01fb5ba74e_m.jpg" alt="" /></a><br />Partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 28 / James St. John</span>

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Micaceous kimberlite (Stockdale Diatreme, Cretaceous; Riley County, Kansas, 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/53551809152.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/53551809152_985d5801d6_m.jpg" alt="" /></a><br />Micaceous kimberlite (Stockdale Diatreme, Cretaceous; Riley County, Kansas, USA) 24 / James St. John</span>

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Madupite lamproite (Late Pliocene, 3 Ma; Pilot Butte volcanic center, Leucite Hills, 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/48931170073.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48931170073_4592a7167b_m.jpg" alt="" /></a><br />Madupite lamproite (Late Pliocene, 3 Ma; Pilot Butte volcanic center, Leucite Hills, Wyoming, USA) 6 / 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) 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/46809775731.html" target="_blank"><img src="http://farm8.static.flickr.com/7902/46809775731_d5899c652b_m.jpg" alt="" /></a><br />Aphyric & partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 5 / James St. John</span>

サイズ変更など

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