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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) 31
Rhyodacite vitrophyre (Llao Rock Rhyodacite, Holocene, ~7.8-7.9 ka; roadcut near Llao Rock, margin of 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

Rhyodacite vitrophyre (Llao Rock Rhyodacite, Holocene, ~7.8-7.9 ka; roadcut near Llao Rock, margin of Crater Lake Caldera, Oregon, USA) 5
Rhyodacite vitrophyre (Llao Rock Rhyodacite, Holocene, ~7.8-7.9 ka; roadcut near Llao Rock, margin of Crater Lake Caldera, Oregon, USA) 5
by James St. John

クリエイティブ・コモンズ 表示 2.1

Matthews Hill (wyomingite lamproite volcanic center in the Leucite Hills, Wyoming, USA) 13
Matthews Hill (wyomingite lamproite volcanic center in the Leucite Hills, Wyoming, USA) 13
by James St. John

クリエイティブ・コモンズ 表示 2.1


Lugarite (Lugar Sill, Early Permian, 288 Ma; near Lugar, Ayrshire, Scotland) 1
Lugarite (Lugar Sill, Early Permian, 288 Ma; near Lugar, Ayrshire, Scotland) 1
by James St. John

クリエイティブ・コモンズ 表示 2.1

Llao Rock (Crater Lake Caldera, Oregon, USA) 20
Llao Rock (Crater Lake Caldera, Oregon, USA) 20
by James St. John

クリエイティブ・コモンズ 表示 2.1

Lugarite (Lugar Sill, Early Permian, 288 Ma; near Lugar, Ayrshire, Scotland) 3
Lugarite (Lugar Sill, Early Permian, 288 Ma; near Lugar, Ayrshire, Scotland) 3
by James St. John

クリエイティブ・コモンズ 表示 2.1


Rhyodacite vitrophyre (Llao Rock Rhyodacite, Holocene, ~7.8-7.9 ka; roadcut near Llao Rock, margin of Crater Lake Caldera, Oregon, USA) 15
Rhyodacite vitrophyre (Llao Rock Rhyodacite, Holocene, ~7.8-7.9 ka; roadcut near Llao Rock, margin of Crater Lake Caldera, Oregon, USA) 15
by James St. John

クリエイティブ・コモンズ 表示 2.1

Hot Creek Rhyolite Flow (Pleistocene, 288 or 333 ka; Hot Creek Gorge, Long Valley Caldera, California, USA) 6
Hot Creek Rhyolite Flow (Pleistocene, 288 or 333 ka; Hot Creek Gorge, Long Valley Caldera, California, USA) 6
by James St. John

クリエイティブ・コモンズ 表示 2.1

Porphyritic granodiorite (Mission Stock, Archean; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 1
Porphyritic granodiorite (Mission Stock, Archean; 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


Llao Rock (Crater Lake Caldera, Oregon, USA) 2
Llao Rock (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

Rhyodacite vitrophyre (Llao Rock Rhyodacite, Holocene, ~7.8-7.9 ka; roadcut near Llao Rock, margin of Crater Lake Caldera, Oregon, USA) 44
Rhyodacite vitrophyre (Llao Rock Rhyodacite, Holocene, ~7.8-7.9 ka; roadcut near Llao Rock, margin of Crater Lake Caldera, Oregon, USA) 44
by James St. John

クリエイティブ・コモンズ 表示 2.1

Rhyodacite vitrophyre (Llao Rock Rhyodacite, Holocene, ~7.8-7.9 ka; roadcut near Llao Rock, margin of Crater Lake Caldera, Oregon, USA) 36
Rhyodacite vitrophyre (Llao Rock Rhyodacite, Holocene, ~7.8-7.9 ka; roadcut near Llao Rock, margin of Crater Lake Caldera, Oregon, USA) 36
by James St. John

クリエイティブ・コモンズ 表示 2.1


Sandorite lamprophyre with xenoliths (Sandor Dike, Neoarchean, 2.703 Ga; Route 17 roadcut northeast of Wasp Lake & north of Wawa, Ontario, Canada) 13
Sandorite lamprophyre with xenoliths (Sandor Dike, Neoarchean, 2.703 Ga; Route 17 roadcut northeast of Wasp Lake & north of Wawa, Ontario, Canada) 13
by James St. John

クリエイティブ・コモンズ 表示 2.1

Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 9
Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 9
by James St. John

クリエイティブ・コモンズ 表示 2.1

Xenoliths in monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 3
Xenoliths in monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 3
by James St. John

クリエイティブ・コモンズ 表示 2.1


Hot Creek Rhyolite Flow (Pleistocene, 288 or 333 ka; Hot Creek Gorge, Long Valley Caldera, California, USA) 43
Hot Creek Rhyolite Flow (Pleistocene, 288 or 333 ka; Hot Creek Gorge, Long Valley Caldera, California, USA) 43
by James St. John

クリエイティブ・コモンズ 表示 2.1

Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 37
Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 37
by James St. John

クリエイティブ・コモンズ 表示 2.1

Rhyodacite vitrophyre (Llao Rock Rhyodacite, Holocene, ~7.8-7.9 ka; roadcut near Llao Rock, margin of Crater Lake Caldera, Oregon, USA) 35
Rhyodacite vitrophyre (Llao Rock Rhyodacite, Holocene, ~7.8-7.9 ka; roadcut near Llao Rock, margin of Crater Lake Caldera, Oregon, USA) 35
by James St. John

クリエイティブ・コモンズ 表示 2.1


Lugarite (Lugar Sill, Early Permian, 288 Ma; near Lugar, Ayrshire, Scotland) 2
Lugarite (Lugar Sill, Early Permian, 288 Ma; near Lugar, Ayrshire, Scotland) 2
by James St. John

クリエイティブ・コモンズ 表示 2.1

Actinolite xenolith in sandorite lamprophyre (Sandor Dike, Neoarchean, 2.703 Ga; Route 17 roadcut northeast of Wasp Lake & north of Wawa, Ontario, Canada) 2
Actinolite xenolith in sandorite lamprophyre (Sandor Dike, Neoarchean, 2.703 Ga; Route 17 roadcut northeast of Wasp Lake & north of Wawa, Ontario, Canada) 2
by James St. John

クリエイティブ・コモンズ 表示 2.1

Porphyritic granodiorite (Mission Stock, Archean; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 2
Porphyritic granodiorite (Mission Stock, Archean; 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


View of LaSal Mountains from Arches National Park, Utah
View of LaSal Mountains from Arches National Park, Utah
by Ken Lund

クリエイティブ・コモンズ 表示-継承 2.1

Actinolite xenolith & sandorite lamprophyre (Sandor Dike, Neoarchean, 2.703 Ga; Route 17 roadcut northeast of Wasp Lake & north of Wawa, Ontario, Canada) 19
Actinolite xenolith & sandorite lamprophyre (Sandor Dike, Neoarchean, 2.703 Ga; Route 17 roadcut northeast of Wasp Lake & north of Wawa, Ontario, Canada) 19
by James St. John

クリエイティブ・コモンズ 表示 2.1

Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 35
Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 35
by James St. John

クリエイティブ・コモンズ 表示 2.1


Rhyodacite lava & pumice-fall deposit (Holocene, ~7.8 to 7.9 ka; eastern flanks of Llao Rock, Crater Lake Caldera, Oregon, USA) 3
Rhyodacite lava & pumice-fall deposit (Holocene, ~7.8 to 7.9 ka; eastern flanks of Llao Rock, 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

Sandorite lamprophyre (Sandor Dike, Neoarchean, 2.703 Ga; Route 17 roadcut northeast of Wasp Lake & north of Wawa, Ontario, Canada) 7
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

Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 11
Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 11
by James St. John

クリエイティブ・コモンズ 表示 2.1


Llao Rock (Crater Lake Caldera, Oregon, USA) 33
Llao Rock (Crater Lake Caldera, Oregon, USA) 33
by James St. John

クリエイティブ・コモンズ 表示 2.1

Actinolite xenolith & sandorite lamprophyre (Sandor Dike, Neoarchean, 2.703 Ga; Route 17 roadcut northeast of Wasp Lake & north of Wawa, Ontario, Canada) 17
Actinolite xenolith & sandorite lamprophyre (Sandor Dike, Neoarchean, 2.703 Ga; Route 17 roadcut northeast of Wasp Lake & north of Wawa, Ontario, Canada) 17
by James St. John

クリエイティブ・コモンズ 表示 2.1

Actinolite xenolith in sandorite lamprophyre (Sandor Dike, Neoarchean, 2.703 Ga; Route 17 roadcut northeast of Wasp Lake & north of Wawa, Ontario, Canada) 4
Actinolite xenolith in sandorite lamprophyre (Sandor Dike, Neoarchean, 2.703 Ga; Route 17 roadcut northeast of Wasp Lake & north of Wawa, Ontario, Canada) 4
by James St. John

クリエイティブ・コモンズ 表示 2.1


Andesite (near Belleville, Mineral County, Nevada, USA) 11
Andesite (near Belleville, Mineral County, Nevada, USA) 11
by James St. John

クリエイティブ・コモンズ 表示 2.1

Hot Creek Rhyolite Flow (Pleistocene, 288 or 333 ka; Hot Creek Gorge, Long Valley Caldera, California, USA) 17
Hot Creek Rhyolite Flow (Pleistocene, 288 or 333 ka; Hot Creek Gorge, 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

Glomeroporphyritic basalt (Yachats Basalt, Upper Eocene, ~36-37 Ma; Heceta Head beach, coastal Oregon, USA) 2
Glomeroporphyritic basalt (Yachats Basalt, Upper Eocene, ~36-37 Ma; Heceta Head beach, coastal Oregon, USA) 2
by James St. John

クリエイティブ・コモンズ 表示 2.1


Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 7
Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 7
by James St. John

クリエイティブ・コモンズ 表示 2.1

Dacite (Tertiary; Mt. General, San Bernardino County, California, USA) 22
Dacite (Tertiary; Mt. General, San Bernardino County, California, USA) 22
by James St. John

クリエイティブ・コモンズ 表示 2.1

Dacite (Tertiary; Mt. General, San Bernardino County, California, USA) 21
Dacite (Tertiary; Mt. General, San Bernardino County, California, USA) 21
by James St. John

クリエイティブ・コモンズ 表示 2.1


Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 34
Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 34
by James St. John

クリエイティブ・コモンズ 表示 2.1

Hot Creek Rhyolite Flow (Pleistocene, 288 or 333 ka; Hot Creek Gorge, Long Valley Caldera, California, USA) 40
Hot Creek Rhyolite Flow (Pleistocene, 288 or 333 ka; Hot Creek Gorge, Long Valley Caldera, California, USA) 40
by James St. John

クリエイティブ・コモンズ 表示 2.1

Lugarite (Lugar Sill, Early Permian, 288 Ma; near Lugar, Ayrshire, Scotland) 5
Lugarite (Lugar Sill, Early Permian, 288 Ma; near Lugar, Ayrshire, Scotland) 5
by James St. John

クリエイティブ・コモンズ 表示 2.1


Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 20
Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 20
by James St. John

クリエイティブ・コモンズ 表示 2.1

Actinolite xenolith & sandorite lamprophyre (Sandor Dike, Neoarchean, 2.703 Ga; Route 17 roadcut northeast of Wasp Lake & north of Wawa, Ontario, Canada) 15
Actinolite xenolith & sandorite lamprophyre (Sandor Dike, Neoarchean, 2.703 Ga; Route 17 roadcut northeast of Wasp Lake & north of Wawa, Ontario, Canada) 15
by James St. John

クリエイティブ・コモンズ 表示 2.1

Cartier Granite (Neoarchean; 2.642 Ga; Crab Lake South roadcut, south-southeast of Cartier, Ontario, Canada) 4
Cartier Granite (Neoarchean; 2.642 Ga; Crab Lake South roadcut, south-southeast of Cartier, Ontario, Canada) 4
by James St. John

クリエイティブ・コモンズ 表示 2.1


Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 21
Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 21
by James St. John

クリエイティブ・コモンズ 表示 2.1

Actinolite xenolith in sandorite lamprophyre (Sandor Dike, Neoarchean, 2.703 Ga; Route 17 roadcut northeast of Wasp Lake & north of Wawa, Ontario, Canada) 1
Actinolite xenolith in sandorite lamprophyre (Sandor Dike, Neoarchean, 2.703 Ga; Route 17 roadcut northeast of Wasp Lake & north of Wawa, Ontario, Canada) 1
by James St. John

クリエイティブ・コモンズ 表示 2.1

Porphyritic rhyodacite (Holocene; Chaos Jumbles Landslide, Lassen Volcano National Park, California, USA) 5
Porphyritic rhyodacite (Holocene; Chaos Jumbles Landslide, 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


Lugarite (Lugar Sill, Early Permian, 288 Ma; near Lugar, Ayrshire, Scotland) 7
Lugarite (Lugar Sill, Early Permian, 288 Ma; near Lugar, Ayrshire, Scotland) 7
by James St. John

クリエイティブ・コモンズ 表示 2.1

Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 13
Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 13
by James St. John

クリエイティブ・コモンズ 表示 2.1

Llao Rock (Crater Lake Caldera, Oregon, USA) 32
Llao Rock (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


Lugarite (Lugar Sill, Early Permian, 288 Ma; near Lugar, Ayrshire, Scotland) 6
Lugarite (Lugar Sill, Early Permian, 288 Ma; near Lugar, Ayrshire, Scotland) 6
by James St. John

クリエイティブ・コモンズ 表示 2.1

Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 14
Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 14
by James St. John

クリエイティブ・コモンズ 表示 2.1

Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 15
Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 15
by James St. John

クリエイティブ・コモンズ 表示 2.1


Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 22
Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 22
by James St. John

クリエイティブ・コモンズ 表示 2.1

Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 24
Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 24
by James St. John

クリエイティブ・コモンズ 表示 2.1

Dacite (Tertiary; Mt. General, San Bernardino County, California, USA) 17
Dacite (Tertiary; Mt. General, San Bernardino County, California, USA) 17
by James St. John

クリエイティブ・コモンズ 表示 2.1


Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 26
Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 26
by James St. John

クリエイティブ・コモンズ 表示 2.1

Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 6
Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 6
by James St. John

クリエイティブ・コモンズ 表示 2.1

Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 4
Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 4
by James St. John

クリエイティブ・コモンズ 表示 2.1


Granodiorite (Mission Stock, Archean; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 2
Granodiorite (Mission Stock, Archean; 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

Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 32
Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 32
by James St. John

クリエイティブ・コモンズ 表示 2.1

Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 23
Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 23
by James St. John

クリエイティブ・コモンズ 表示 2.1



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