phenocryst

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Wyomingite (Lower Pleistocene, 0.95 Ma; quarry on volcanic cone on Zirkel Mesa, Leucite Hills Volcanic Province, 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/49979704657.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/49979704657_5e54691775_m.jpg" alt="" /></a><br />Wyomingite (Lower Pleistocene, 0.95 Ma; quarry on volcanic cone on Zirkel Mesa, Leucite Hills Volcanic Province, Wyoming, USA) 12 / 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) 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/49979703807.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/49979703807_f3f30ee0cf_m.jpg" alt="" /></a><br />Wyomingite (Lower Pleistocene, 0.95 Ma; quarry on volcanic cone on Zirkel Mesa, Leucite Hills Volcanic Province, Wyoming, USA) 13 / 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) 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/37517475046.html" target="_blank"><img src="http://farm5.static.flickr.com/4449/37517475046_dbb05e3d92_m.jpg" alt="" /></a><br />Pinkish-reddish porphyritic dacite (Upper Pleistocene, 27 ka; Devastated Area, Lassen Volcano National Park, California, 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) 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/48342719252.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48342719252_e0e218f3e3_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) 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) 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/47927008412.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/47927008412_c5707f8ec5_m.jpg" alt="" /></a><br />Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 42 / James St. John</span>

サイズ変更など

Pilot Butte (Pliocene madupite lamproite volcanic center in the Leucite Hills, 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/48931738722.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48931738722_b78c5882f8_m.jpg" alt="" /></a><br />Pilot Butte (Pliocene madupite lamproite volcanic center in the Leucite Hills, Wyoming, USA) 7 / 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) 50
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/26870806777.html" target="_blank"><img src="http://farm1.static.flickr.com/830/26870806777_d95aaab219_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) 50 / 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) 23
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/46091691894.html" target="_blank"><img src="http://farm8.static.flickr.com/7806/46091691894_68b5eac0e6_m.jpg" alt="" /></a><br />Partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 23 / James St. John</span>

サイズ変更など

Madupite lamproite (Late Pliocene, 3 Ma; Pilot Butte volcanic center, Leucite Hills, 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/48931173713.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48931173713_ec0d892380_m.jpg" alt="" /></a><br />Madupite lamproite (Late Pliocene, 3 Ma; Pilot Butte volcanic center, Leucite Hills, Wyoming, USA) 5 / James St. John</span>

サイズ変更など

Xenolith in monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 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/47926945627.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/47926945627_f8526cf744_m.jpg" alt="" /></a><br />Xenolith in monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 2 / James St. John</span>

サイズ変更など

Pilot Butte (Pliocene madupite lamproite volcanic center in the Leucite Hills, 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/48931756202.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48931756202_aeaaffdcb5_m.jpg" alt="" /></a><br />Pilot Butte (Pliocene madupite lamproite volcanic center in the Leucite Hills, Wyoming, USA) 14 / 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) 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/41730448181.html" target="_blank"><img src="http://farm1.static.flickr.com/872/41730448181_fcd83bd345_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) 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) 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/48343269472.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48343269472_11d938ebd5_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) 20 / 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) 57
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/41698446552.html" target="_blank"><img src="http://farm1.static.flickr.com/957/41698446552_219e4f935b_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) 57 / 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) 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/41020738924.html" target="_blank"><img src="http://farm1.static.flickr.com/979/41020738924_7bf3977aba_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) 34 / James St. John</span>

サイズ変更など

Xenolith in monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, 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/47926949242.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/47926949242_c3f73231f1_m.jpg" alt="" /></a><br />Xenolith in monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 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) 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/46816705111.html" target="_blank"><img src="http://farm5.static.flickr.com/4890/46816705111_96b12f1fb5_m.jpg" alt="" /></a><br />Partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 25 / 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) 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/52307939514.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52307939514_91cbff7759_m.jpg" alt="" /></a><br />Hot Creek Rhyolite Flow (Pleistocene, 288 or 333 ka; Hot Creek Gorge, Long Valley Caldera, California, USA) 8 / James St. John</span>

サイズ変更など

Dacite (Tertiary; Mt. General, San Bernardino County, 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/50506844513.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50506844513_4790002659_m.jpg" alt="" /></a><br />Dacite (Tertiary; Mt. General, San Bernardino County, California, USA) 24 / James St. John</span>

サイズ変更など

Micaceous kimberlite (Stockdale Diatreme, Cretaceous; Riley County, Kansas, 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/53553006324.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/53553006324_505cedd61c_m.jpg" alt="" /></a><br />Micaceous kimberlite (Stockdale Diatreme, Cretaceous; Riley County, Kansas, USA) 14 / 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) 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/39931657340.html" target="_blank"><img src="http://farm1.static.flickr.com/958/39931657340_7b7ff46906_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) 52 / James St. John</span>

サイズ変更など

Madupite lamproite (Late Pliocene, 3 Ma; Pilot Butte volcanic center, Leucite Hills, Wyoming, 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/48931703681.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48931703681_3eed44985c_m.jpg" alt="" /></a><br />Madupite lamproite (Late Pliocene, 3 Ma; Pilot Butte volcanic center, Leucite Hills, Wyoming, USA) 8 / James St. John</span>

サイズ変更など

Madupite lamproite (Late Pliocene, 3 Ma; Pilot Butte volcanic center, Leucite Hills, 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/48931152463.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48931152463_efca6f2751_m.jpg" alt="" /></a><br />Madupite lamproite (Late Pliocene, 3 Ma; Pilot Butte volcanic center, Leucite Hills, Wyoming, USA) 11 / 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) 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/41732725341.html" target="_blank"><img src="http://farm1.static.flickr.com/961/41732725341_189aa2f4d6_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) 14 / James St. John</span>

サイズ変更など

Hot Creek (Long Valley Caldera, 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/52330937798.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52330937798_8b669b7a97_m.jpg" alt="" /></a><br />Hot Creek (Long Valley Caldera, California, USA) 17 / James St. John</span>

サイズ変更など

Large fusiform airfall lapillus (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/30869915034.html" target="_blank"><img src="http://farm1.static.flickr.com/725/30869915034_4ac0a6e537_m.jpg" alt="" /></a><br />Large fusiform airfall lapillus (Middle Pleistocene, 670 ka; Black Rock Volcano, Millard County, Utah, USA) 1 / 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) 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/48343310807.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48343310807_9b059de17f_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) 14 / James St. John</span>

サイズ変更など

Hyalite opal on vesicular porphyritic leucite tephrite (Doupov Volcanic Complex, Oligocene to Lower Miocene; hills of the Doupov Mountains, north or west of Valec (Waltsch), northwestern Bohemia) 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/14957099817.html" target="_blank"><img src="http://farm4.static.flickr.com/3857/14957099817_2b373126a1_m.jpg" alt="" /></a><br />Hyalite opal on vesicular porphyritic leucite tephrite (Doupov Volcanic Complex, Oligocene to Lower Miocene; hills of the Doupov Mountains, north or west of Valec (Waltsch), northwestern Bohemia) 3 / James St. John</span>

サイズ変更など

Madupite lamproite (Late Pliocene, 3 Ma; Pilot Butte volcanic center, Leucite Hills, Wyoming, USA) 15
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/48931680451.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48931680451_dbbba55cf0_m.jpg" alt="" /></a><br />Madupite lamproite (Late Pliocene, 3 Ma; Pilot Butte volcanic center, Leucite Hills, Wyoming, USA) 15 / James St. John</span>

サイズ変更など

Pilot Butte (Pliocene madupite lamproite volcanic center in the Leucite Hills, Wyoming, USA) 16
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/48931562231.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48931562231_0639b46927_m.jpg" alt="" /></a><br />Pilot Butte (Pliocene madupite lamproite volcanic center in the Leucite Hills, Wyoming, USA) 16 / 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) 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/26864532597.html" target="_blank"><img src="http://farm1.static.flickr.com/832/26864532597_7755e37e9c_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) 18 / 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) 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/49979702992.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/49979702992_2be773996d_m.jpg" alt="" /></a><br />Wyomingite (Lower Pleistocene, 0.95 Ma; quarry on volcanic cone on Zirkel Mesa, Leucite Hills Volcanic Province, Wyoming, USA) 14 / 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) 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/37517504956.html" target="_blank"><img src="http://farm5.static.flickr.com/4500/37517504956_70b1cf630f_m.jpg" alt="" /></a><br />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

Pinkish-reddish porphyritic dacite (Upper Pleistocene, 27 ka; 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/36855426974.html" target="_blank"><img src="http://farm5.static.flickr.com/4512/36855426974_0a17b3a129_m.jpg" alt="" /></a><br />Pinkish-reddish porphyritic dacite (Upper Pleistocene, 27 ka; Devastated Area, Lassen Volcano National Park, California, USA) 12 / 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) 38
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/47926935863.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/47926935863_f4f681f150_m.jpg" alt="" /></a><br />Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 38 / 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) 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/27861750238.html" target="_blank"><img src="http://farm1.static.flickr.com/970/27861750238_a4503e2899_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) 7 / James St. John</span>

サイズ変更など

Madupite lamproite (Late Pliocene, 3 Ma; Pilot Butte volcanic center, Leucite Hills, Wyoming, USA) 10
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/48931696566.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48931696566_c0f50ef8f5_m.jpg" alt="" /></a><br />Madupite lamproite (Late Pliocene, 3 Ma; Pilot Butte volcanic center, Leucite Hills, Wyoming, USA) 10 / 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) 38
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/36865900134.html" target="_blank"><img src="http://farm5.static.flickr.com/4458/36865900134_3f37bfa09b_m.jpg" alt="" /></a><br />Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 38 / James St. John</span>

サイズ変更など

Dacite (Tertiary; Mt. General, San Bernardino County, California, USA) 23
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/50507556211.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50507556211_4b26200e95_m.jpg" alt="" /></a><br />Dacite (Tertiary; Mt. General, San Bernardino County, California, USA) 23 / James St. John</span>

サイズ変更など

Llao Rock (Crater Lake Caldera, Oregon, 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/40219677580.html" target="_blank"><img src="http://farm1.static.flickr.com/909/40219677580_4cafa52001_m.jpg" alt="" /></a><br />Llao Rock (Crater Lake Caldera, Oregon, USA) 21 / James St. John</span>

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Lugarite (Lugar Sill, Early Permian, 288 Ma; near Lugar, Ayrshire, Scotland) 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/50595624627.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50595624627_3bee551c93_m.jpg" alt="" /></a><br />Lugarite (Lugar Sill, Early Permian, 288 Ma; near Lugar, Ayrshire, Scotland) 4 / 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) 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/27869109658.html" target="_blank"><img src="http://farm1.static.flickr.com/904/27869109658_0df1163fc2_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) 32 / James St. John</span>

サイズ変更など

Madupite lamproite (Late Pliocene, 3 Ma; Pilot Butte volcanic center, Leucite Hills, 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/48931686351.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48931686351_33ee0d475a_m.jpg" alt="" /></a><br />Madupite lamproite (Late Pliocene, 3 Ma; Pilot Butte volcanic center, Leucite Hills, Wyoming, USA) 13 / James St. John</span>

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Pilot Butte (Pliocene madupite lamproite volcanic center in the Leucite Hills, Wyoming, USA) 17
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/48931745962.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48931745962_b85f07053a_m.jpg" alt="" /></a><br />Pilot Butte (Pliocene madupite lamproite volcanic center in the Leucite Hills, Wyoming, USA) 17 / James St. John</span>

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Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 40
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/47926986412.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/47926986412_283d8b126e_m.jpg" alt="" /></a><br />Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 40 / 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) 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/48342586726.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48342586726_2792c16d9b_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) 8 / James St. John</span>

サイズ変更など

Porphyritic rhyodacite (Holocene; Chaos Jumbles Landslide, 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/36907336704.html" target="_blank"><img src="http://farm5.static.flickr.com/4480/36907336704_4006dfcf4e_m.jpg" alt="" /></a><br />Porphyritic rhyodacite (Holocene; Chaos Jumbles Landslide, Lassen Volcano National Park, California, USA) 7 / 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) 38
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/27869244248.html" target="_blank"><img src="http://farm1.static.flickr.com/964/27869244248_285a5c5486_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) 38 / 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) 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/52771778888.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52771778888_ece7158acb_m.jpg" alt="" /></a><br />Basalt (McCartys Flow, Holocene, ~2.4 to 3.9 ka; southeast of Grants, New Mexico, USA) 17 / 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) 40
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/37527567246.html" target="_blank"><img src="http://farm5.static.flickr.com/4448/37527567246_9499a89759_m.jpg" alt="" /></a><br />Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 40 / James St. John</span>

サイズ変更など

Madupite lamproite (Late Pliocene, 3 Ma; Pilot Butte volcanic center, Leucite Hills, 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/48931689496.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48931689496_d1f73d58b6_m.jpg" alt="" /></a><br />Madupite lamproite (Late Pliocene, 3 Ma; Pilot Butte volcanic center, Leucite Hills, Wyoming, USA) 12 / 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) 41
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/47927018486.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/47927018486_90b562b543_m.jpg" alt="" /></a><br />Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 41 / James St. John</span>

サイズ変更など

Rhyodacite vitrophyre (Llao Rock Rhyodacite, Holocene, ~7.8-7.9 ka; roadcut near Llao Rock, margin of Crater Lake Caldera, Oregon, USA) 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/26870865427.html" target="_blank"><img src="http://farm1.static.flickr.com/969/26870865427_287161cecd_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) 54 / 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) 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/41015188644.html" target="_blank"><img src="http://farm1.static.flickr.com/944/41015188644_80d137d884_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) 21 / James St. John</span>

サイズ変更など

Dacite (Tertiary; Mt. General, San Bernardino County, 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/50507556126.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50507556126_f0b82f596f_m.jpg" alt="" /></a><br />Dacite (Tertiary; Mt. General, San Bernardino County, California, USA) 25 / James St. John</span>

サイズ変更など

Dacite (Tertiary; Mt. General, San Bernardino County, California, USA) 26
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/50507718982.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50507718982_c6f8f25932_m.jpg" alt="" /></a><br />Dacite (Tertiary; Mt. General, San Bernardino County, California, USA) 26 / James St. John</span>

サイズ変更など

Madupite lamproite (Late Pliocene, 3 Ma; Pilot Butte volcanic center, Leucite Hills, Wyoming, USA) 16
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/48931676911.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48931676911_9a98697f61_m.jpg" alt="" /></a><br />Madupite lamproite (Late Pliocene, 3 Ma; Pilot Butte volcanic center, Leucite Hills, Wyoming, USA) 16 / 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) 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/39936678860.html" target="_blank"><img src="http://farm1.static.flickr.com/828/39936678860_cd44ccc5cb_m.jpg" alt="" /></a><br />Red Cone (Late Pleistocene cinder cone with basaltic andesite, 35-36 ka; northwest of Crater Lake Caldera, Oregon, USA) 1 / James St. John</span>

サイズ変更など

Madupite lamproite (Late Pliocene, 3 Ma; Pilot Butte volcanic center, Leucite Hills, 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/48931683286.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48931683286_8e60d66769_m.jpg" alt="" /></a><br />Madupite lamproite (Late Pliocene, 3 Ma; Pilot Butte volcanic center, Leucite Hills, Wyoming, USA) 14 / 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) 39
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/47926932003.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/47926932003_453b4cfaa2_m.jpg" alt="" /></a><br />Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 39 / James St. John</span>

サイズ変更など

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