metamorphism

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Winston-Salem, North Carolina magnitude 2.3 earthquake (4:05 AM, 24 November 2021)
by James St. John

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/51702525393.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51702525393_48b2c81b5c_m.jpg" alt="" /></a><br />Winston-Salem, North Carolina magnitude 2.3 earthquake (4:05 AM, 24 November 2021) / James St. John</span>

サイズ変更など

Asymmetrical ripple marks in quartzite (Baraboo Quartzite, upper Paleoproterozoic, ~1.7 Ga; southern shore of Devil's Lake, Devil's Lake State Park, Wisconsin, 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/18817680902.html" target="_blank"><img src="http://farm6.static.flickr.com/5328/18817680902_9bcbf97f22_m.jpg" alt="" /></a><br />Asymmetrical ripple marks in quartzite (Baraboo Quartzite, upper Paleoproterozoic, ~1.7 Ga; southern shore of Devil's Lake, Devil's Lake State Park, Wisconsin, USA) 6 / James St. John</span>

サイズ変更など

Iguana Green Granite (gneiss) (quarry near Messias Targino, Rio Grande do Norte, Brazil) 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/34006917255.html" target="_blank"><img src="http://farm3.static.flickr.com/2848/34006917255_d6b85a0204_m.jpg" alt="" /></a><br />Iguana Green Granite (gneiss) (quarry near Messias Targino, Rio Grande do Norte, Brazil) 8 / James St. John</span>

サイズ変更など

Otter Creek (Baxter Hollow, South Range of the Baraboo Ranges, Wisconsin, 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/18848662191.html" target="_blank"><img src="http://farm4.static.flickr.com/3681/18848662191_4f9bfa5034_m.jpg" alt="" /></a><br />Otter Creek (Baxter Hollow, South Range of the Baraboo Ranges, Wisconsin, USA) / James St. John</span>

サイズ変更など

Overturned cross-bedding in pebbly quartzite (Baraboo Quartzite, upper Paleoproterozoic, ~1.7 Ga; Tumbled Rocks Trail, Devil's Lake State Park, Wisconsin, 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/18813953622.html" target="_blank"><img src="http://farm6.static.flickr.com/5340/18813953622_32d6555abb_m.jpg" alt="" /></a><br />Overturned cross-bedding in pebbly quartzite (Baraboo Quartzite, upper Paleoproterozoic, ~1.7 Ga; Tumbled Rocks Trail, Devil's Lake State Park, Wisconsin, USA) 4 / James St. John</span>

サイズ変更など

Fluvial polish (Sioux Quartzite, Paleoproterozoic, 1.65-1.70 Ga; Falls Park, Sioux Falls, South Dakota, 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/52406135961.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52406135961_1837de762c_m.jpg" alt="" /></a><br />Fluvial polish (Sioux Quartzite, Paleoproterozoic, 1.65-1.70 Ga; Falls Park, Sioux Falls, South Dakota, USA) 10 / James St. John</span>

サイズ変更など

Verde Bamboo Granite (epidotic metasandstone) (Ipuçaba Formation, Mesoproterozoic, 1.6-1.7 Ga; Bahia, Brazil) 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/34861700182.html" target="_blank"><img src="http://farm5.static.flickr.com/4267/34861700182_74fa1a72e8_m.jpg" alt="" /></a><br />Verde Bamboo Granite (epidotic metasandstone) (Ipuçaba Formation, Mesoproterozoic, 1.6-1.7 Ga; Bahia, Brazil) 3 / James St. John</span>

サイズ変更など

Anthracite coal (Middle Pennsylvanian; Pioneer Tunnel Coal Mine, Ashland, Pennsylvania, 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/8286947051.html" target="_blank"><img src="http://farm9.static.flickr.com/8057/8286947051_74c831dfd8_m.jpg" alt="" /></a><br />Anthracite coal (Middle Pennsylvanian; Pioneer Tunnel Coal Mine, Ashland, Pennsylvania, USA) 3 / James St. John</span>

サイズ変更など

Glen Mine (old iron mine pit in Chisholm, Mesabi Iron Range, Minnesota, 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/22938289644.html" target="_blank"><img src="http://farm1.static.flickr.com/779/22938289644_41d266e978_m.jpg" alt="" /></a><br />Glen Mine (old iron mine pit in Chisholm, Mesabi Iron Range, Minnesota, USA) 1 / James St. John</span>

サイズ変更など

Metamorphosed pillow basalt (Ely Greenstone, Neoarchean, ~2.722 Ga; large glacial erratic along Main Street, Ely, Minnesota, 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/21266370830.html" target="_blank"><img src="http://farm6.static.flickr.com/5809/21266370830_fa27699714_m.jpg" alt="" /></a><br />Metamorphosed pillow basalt (Ely Greenstone, Neoarchean, ~2.722 Ga; large glacial erratic along Main Street, Ely, Minnesota, USA) 3 / James St. John</span>

サイズ変更など

Metamorphosed pillow basalt (Ely Greenstone, Neoarchean, ~2.722 Ga; Rt. 169 roadcut just east of Ely, Minnesota, 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/20905105873.html" target="_blank"><img src="http://farm1.static.flickr.com/564/20905105873_c82c31dafd_m.jpg" alt="" /></a><br />Metamorphosed pillow basalt (Ely Greenstone, Neoarchean, ~2.722 Ga; Rt. 169 roadcut just east of Ely, Minnesota, USA) 7 / James St. John</span>

サイズ変更など

Polymetallic massive sulfide (Middle Tholeiitic Unit, Kidd-Munro Assemblage, Neoarchean, 2.711 to 2.719 Ga; drill cores at the Potter Mine, east of Timmins, 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/47083374074.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/47083374074_335a254be4_m.jpg" alt="" /></a><br />Polymetallic massive sulfide (Middle Tholeiitic Unit, Kidd-Munro Assemblage, Neoarchean, 2.711 to 2.719 Ga; drill cores at the Potter Mine, east of Timmins, Ontario, Canada) 3 / James St. John</span>

サイズ変更など

Serpentinite (Livengood Ophiolite, Early Cambrian; near Livengood, Alaska, 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/51741170683.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51741170683_434014e1c1_m.jpg" alt="" /></a><br />Serpentinite (Livengood Ophiolite, Early Cambrian; near Livengood, Alaska, USA) 5 / James St. John</span>

サイズ変更など

Garnetiferous blueschist (Ward Creek, Sonoma County, California, USA) 2
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/50515152137.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50515152137_f6307441dc_m.jpg" alt="" /></a><br />Garnetiferous blueschist (Ward Creek, Sonoma County, California, USA) 2 / James St. John</span>

サイズ変更など

Otter Creek & gravel bar of Baraboo Quartzite clasts (Baxter Hollow, South Range of the Baraboo Ranges, Wisconsin, 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/18658260148.html" target="_blank"><img src="http://farm4.static.flickr.com/3844/18658260148_f9ff2d04c0_m.jpg" alt="" /></a><br />Otter Creek & gravel bar of Baraboo Quartzite clasts (Baxter Hollow, South Range of the Baraboo Ranges, Wisconsin, USA) 3 / James St. John</span>

サイズ変更など

Faulted metamorphosed pillow basalt (Ely Greenstone, Neoarchean, ~2.722 Ga; Rt. 169 roadcut just east of Ely, 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/20904253594.html" target="_blank"><img src="http://farm1.static.flickr.com/751/20904253594_04e3302998_m.jpg" alt="" /></a><br />Faulted metamorphosed pillow basalt (Ely Greenstone, Neoarchean, ~2.722 Ga; Rt. 169 roadcut just east of Ely, Minnesota, USA) 5 / James St. John</span>

サイズ変更など

Masi Quartzite (fuchsitic quartzite) (Silurian; Gaskabeivarri, Norway) 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/33617768900.html" target="_blank"><img src="http://farm3.static.flickr.com/2943/33617768900_381f3367da_m.jpg" alt="" /></a><br />Masi Quartzite (fuchsitic quartzite) (Silurian; Gaskabeivarri, Norway) 3 / James St. John</span>

サイズ変更など

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

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/51008069951.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51008069951_ecd7078168_m.jpg" alt="" /></a><br />Black porphyritic metarhyolite (Utley Rhyolite, Paleoproterozoic, 1765 Ma; Utley Rhyolite Quarry, near Green Lake, Wisconsin, USA) 1 / James St. John</span>

サイズ変更など

Orinoco Granite (garnetiferous convoluted gneiss) 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/33171259504.html" target="_blank"><img src="http://farm3.static.flickr.com/2853/33171259504_d9617eedba_m.jpg" alt="" /></a><br />Orinoco Granite (garnetiferous convoluted gneiss) 4 / James St. John</span>

サイズ変更など

Amphibolite (Willyama Supergroup, Paleoproterozoic; Alexandra Mine, Broken Hill Block, New South Wales, Australia) 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/26353541481.html" target="_blank"><img src="http://farm2.static.flickr.com/1518/26353541481_288da3e314_m.jpg" alt="" /></a><br />Amphibolite (Willyama Supergroup, Paleoproterozoic; Alexandra Mine, Broken Hill Block, New South Wales, Australia) 2 / James St. John</span>

サイズ変更など

Asymmetrical ripple marks in quartzite (Baraboo Quartzite, upper Paleoproterozoic, ~1.7 Ga; southern shore of Devil's Lake, Devil's Lake State Park, Wisconsin, 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/18796468576.html" target="_blank"><img src="http://farm6.static.flickr.com/5342/18796468576_a8fc73bd7b_m.jpg" alt="" /></a><br />Asymmetrical ripple marks in quartzite (Baraboo Quartzite, upper Paleoproterozoic, ~1.7 Ga; southern shore of Devil's Lake, Devil's Lake State Park, Wisconsin, USA) 5 / James St. John</span>

サイズ変更など

Juhan Ulfsak metamorphs to Sarastro
by VilleHoo

クリエイティブ・コモンズ表示-継承 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/167594097.html" target="_blank"><img src="http://farm1.static.flickr.com/46/167594097_dc33175aca_m.jpg" alt="" /></a><br />Juhan Ulfsak metamorphs to Sarastro / VilleHoo</span>

サイズ変更など

Garnetite (alteration halo around magnetite-rich meta-iron formation) (Archean, metamorphism at ~3.2 Ga & ~2.8 Ga; Quad Creek section - roadcut along the Beartooth Highway, Beartooth Mountains, Montana, 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/52616901298.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52616901298_c69a5cf942_m.jpg" alt="" /></a><br />Garnetite (alteration halo around magnetite-rich meta-iron formation) (Archean, metamorphism at ~3.2 Ga & ~2.8 Ga; Quad Creek section - roadcut along the Beartooth Highway, Beartooth Mountains, Montana, USA) 6 / James St. John</span>

サイズ変更など

Anorthosite (Ankafotia Anorthosite Massif, Neoproterozoic, ~660 Ma; Madagascar) 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/50420796228.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50420796228_3d96d2a0f2_m.jpg" alt="" /></a><br />Anorthosite (Ankafotia Anorthosite Massif, Neoproterozoic, ~660 Ma; Madagascar) 20 / James St. John</span>

サイズ変更など

Shungite (Zaonezhskaya Formation, middle Paleoproterozoic, 1.98-2.09 Ga; Shun'ga River area, northwestern Russia) 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/50303357872.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50303357872_4233252c3a_m.jpg" alt="" /></a><br />Shungite (Zaonezhskaya Formation, middle Paleoproterozoic, 1.98-2.09 Ga; Shun'ga River area, northwestern Russia) 9 / James St. John</span>

サイズ変更など

Amphibolite (Archean, 3.1-3.2 Ga; Norris South roadcut, Madison County, Montana, 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/45574881922.html" target="_blank"><img src="http://farm2.static.flickr.com/1949/45574881922_28474a7fd1_m.jpg" alt="" /></a><br />Amphibolite (Archean, 3.1-3.2 Ga; Norris South roadcut, Madison County, Montana, USA) 1 / James St. John</span>

サイズ変更など

Hull-Rust-Mahoning Mine (Biwabik Iron-Formation, Paleoproterozoic, ~1.878 Ga; Hibbing, Minnesota, 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/23582303172.html" target="_blank"><img src="http://farm1.static.flickr.com/601/23582303172_491d23f3cb_m.jpg" alt="" /></a><br />Hull-Rust-Mahoning Mine (Biwabik Iron-Formation, Paleoproterozoic, ~1.878 Ga; Hibbing, Minnesota, USA) 1 / James St. John</span>

サイズ変更など

Metamorphosed pillow basalt (Ely Greenstone, Neoarchean, ~2.722 Ga; Rt. 169 roadcut just east of Ely, Minnesota, 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/21500022856.html" target="_blank"><img src="http://farm6.static.flickr.com/5684/21500022856_7f905597c9_m.jpg" alt="" /></a><br />Metamorphosed pillow basalt (Ely Greenstone, Neoarchean, ~2.722 Ga; Rt. 169 roadcut just east of Ely, Minnesota, USA) 8 / James St. John</span>

サイズ変更など

Metamorphosed pillow basalt (Ely Greenstone, Neoarchean, ~2.722 Ga; Rt. 169 roadcut just east of Ely, 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/21338182680.html" target="_blank"><img src="http://farm6.static.flickr.com/5671/21338182680_abbe82f1f6_m.jpg" alt="" /></a><br />Metamorphosed pillow basalt (Ely Greenstone, Neoarchean, ~2.722 Ga; Rt. 169 roadcut just east of Ely, Minnesota, USA) 9 / James St. John</span>

サイズ変更など

Anthracite coal (Middle Pennsylvanian; Pioneer Tunnel Coal Mine, Ashland, Pennsylvania, 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/8288005780.html" target="_blank"><img src="http://farm9.static.flickr.com/8058/8288005780_0645dc6fac_m.jpg" alt="" /></a><br />Anthracite coal (Middle Pennsylvanian; Pioneer Tunnel Coal Mine, Ashland, Pennsylvania, USA) 1 / James St. John</span>

サイズ変更など

Siamo Slate (Paleoproterozoic, 2.1-2.2 Ga; roadcut near Mud Lake, Upper Peninsula of Michigan, 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/51187510309.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51187510309_0bb79cd714_m.jpg" alt="" /></a><br />Siamo Slate (Paleoproterozoic, 2.1-2.2 Ga; roadcut near Mud Lake, Upper Peninsula of Michigan, USA) 3 / James St. John</span>

サイズ変更など

Anyolite (corundum-amphibole zoisitite) (Neoproterozoic; Mundarara Mine, about 27 km west of Longido, Tanzania) 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/49143985086.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/49143985086_74f1ed3927_m.jpg" alt="" /></a><br />Anyolite (corundum-amphibole zoisitite) (Neoproterozoic; Mundarara Mine, about 27 km west of Longido, Tanzania) 5 / James St. John</span>

サイズ変更など

Yellowstone River (Grand Canyon of the Yellowstone, Wyoming, 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/53018183857.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/53018183857_efd2ae02ba_m.jpg" alt="" /></a><br />Yellowstone River (Grand Canyon of the Yellowstone, Wyoming, USA) 3 / James St. John</span>

サイズ変更など

Metamorphosed pillow basalt (Ely Greenstone, Neoarchean, ~2.722 Ga; Rt. 169 roadcut just east of Ely, Minnesota, USA) 2
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/20903538654.html" target="_blank"><img src="http://farm6.static.flickr.com/5717/20903538654_47f6705ab8_m.jpg" alt="" /></a><br />Metamorphosed pillow basalt (Ely Greenstone, Neoarchean, ~2.722 Ga; Rt. 169 roadcut just east of Ely, Minnesota, USA) 2 / James St. John</span>

サイズ変更など

Tremolitic diopside marble (Chocolay Group, Paleoproterozoic; Felch, Michigan, 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/28362288598.html" target="_blank"><img src="http://farm1.static.flickr.com/969/28362288598_f7511763a4_m.jpg" alt="" /></a><br />Tremolitic diopside marble (Chocolay Group, Paleoproterozoic; Felch, Michigan, USA) / James St. John</span>

サイズ変更など

Grand Canyon of the Yellowstone River (Yellowstone, Wyoming, USA) 239
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/49656708618.html" target="_blank"><img src="http://farm0.static.flickr.com/0/49656708618_269cb360f3_m.jpg" alt="" /></a><br />Grand Canyon of the Yellowstone River (Yellowstone, Wyoming, USA) 239 / James St. John</span>

サイズ変更など

Baraboo Quartzite (upper Paleoproterozoic, ~1.7 Ga; just north of Rock Springs, Wisconsin, 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/18780811892.html" target="_blank"><img src="http://farm1.static.flickr.com/402/18780811892_54e4fcafe6_m.jpg" alt="" /></a><br />Baraboo Quartzite (upper Paleoproterozoic, ~1.7 Ga; just north of Rock Springs, Wisconsin, USA) 3 / James St. John</span>

サイズ変更など

Cross-bedding in quartzite (Baraboo Quartzite, upper Paleoproterozoic, ~1.7 Ga; Tumbled Rocks Trail, Devil's Lake State Park, Wisconsin, 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/18195694153.html" target="_blank"><img src="http://farm9.static.flickr.com/8884/18195694153_2ce80399fb_m.jpg" alt="" /></a><br />Cross-bedding in quartzite (Baraboo Quartzite, upper Paleoproterozoic, ~1.7 Ga; Tumbled Rocks Trail, Devil's Lake State Park, Wisconsin, USA) 5 / James St. John</span>

サイズ変更など

Orinoco Granite (garnetiferous convoluted gneiss) 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/33857093222.html" target="_blank"><img src="http://farm3.static.flickr.com/2930/33857093222_bdf4bf68f9_m.jpg" alt="" /></a><br />Orinoco Granite (garnetiferous convoluted gneiss) 6 / James St. John</span>

サイズ変更など

Riebeckite and/or richterite in magnetite-quartz meta-BIF (Goldman Meadows Formation, Mesoarchean, 2.87 Ga; Atlantic City Iron Mine, Wind River Range, Wyoming, 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/20579434403.html" target="_blank"><img src="http://farm6.static.flickr.com/5836/20579434403_84b981a749_m.jpg" alt="" /></a><br />Riebeckite and/or richterite in magnetite-quartz meta-BIF (Goldman Meadows Formation, Mesoarchean, 2.87 Ga; Atlantic City Iron Mine, Wind River Range, Wyoming, USA) / James St. John</span>

サイズ変更など

Novaculite (metachert) (Arkansas Novaculite, Devonian to Mississippian; Arkansas, 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/48783540408.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48783540408_12b5d657ae_m.jpg" alt="" /></a><br />Novaculite (metachert) (Arkansas Novaculite, Devonian to Mississippian; Arkansas, USA) 4 / James St. John</span>

サイズ変更など

Magnetite skarn (Early Miocene, 22-23 Ma; iron mine at Iron Mountain, Utah, 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/52813088441.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52813088441_ef4baf34d1_m.jpg" alt="" /></a><br />Magnetite skarn (Early Miocene, 22-23 Ma; iron mine at Iron Mountain, Utah, USA) 4 / James St. John</span>

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Détails d'un métagabbro du Chenaillet (faciès schiste vert)
by ffigon

クリエイティブ・コモンズ表示-継承 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/17263708565.html" target="_blank"><img src="http://farm8.static.flickr.com/7655/17263708565_9c10b1db0f_m.jpg" alt="" /></a><br />Détails d'un métagabbro du Chenaillet (faciès schiste vert) / ffigon</span>

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Chromitite (Neoarchean; North Star Mine, Red Lodge Chromite District, Beartooth Mountains, Montana, 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/52477315981.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52477315981_99882102d5_m.jpg" alt="" /></a><br />Chromitite (Neoarchean; North Star Mine, Red Lodge Chromite District, Beartooth Mountains, Montana, USA) 10 / James St. John</span>

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Cross-bedding in quartzite (Baraboo Quartzite, upper Paleoproterozoic, ~1.7 Ga; Tumbled Rocks Trail, Devil's Lake State Park, Wisconsin, 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/18816299615.html" target="_blank"><img src="http://farm1.static.flickr.com/293/18816299615_2dd92cd1c0_m.jpg" alt="" /></a><br />Cross-bedding in quartzite (Baraboo Quartzite, upper Paleoproterozoic, ~1.7 Ga; Tumbled Rocks Trail, Devil's Lake State Park, Wisconsin, USA) 1 / James St. John</span>

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Shungite (Zaonezhskaya Formation, middle Paleoproterozoic, 1.98-2.09 Ga; Shun'ga River area, northwestern Russia) 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/50303207086.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50303207086_09a3434e4e_m.jpg" alt="" /></a><br />Shungite (Zaonezhskaya Formation, middle Paleoproterozoic, 1.98-2.09 Ga; Shun'ga River area, northwestern Russia) 10 / James St. John</span>

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Greenstone (metagabbro) (metamorphism at ~2.7 Ga, Neoarchean; Rt. 169 roadcut south of Peyla, Minnesota, 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/23354410021.html" target="_blank"><img src="http://farm1.static.flickr.com/663/23354410021_1ccbb75b64_m.jpg" alt="" /></a><br />Greenstone (metagabbro) (metamorphism at ~2.7 Ga, Neoarchean; Rt. 169 roadcut south of Peyla, Minnesota, USA) 3 / James St. John</span>

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Asymmetrical ripple marks in quartzite (Baraboo Quartzite, upper Paleoproterozoic, ~1.7 Ga; southern shore of Devil's Lake, Devil's Lake State Park, Wisconsin, 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/18635072300.html" target="_blank"><img src="http://farm6.static.flickr.com/5451/18635072300_d50cefb1dd_m.jpg" alt="" /></a><br />Asymmetrical ripple marks in quartzite (Baraboo Quartzite, upper Paleoproterozoic, ~1.7 Ga; southern shore of Devil's Lake, Devil's Lake State Park, Wisconsin, USA) 2 / James St. John</span>

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Biwabik Iron-Formation (Paleoproterozoic, ~1.878 Ga; southern wall of the Hull-Rust-Mahoning Mine, Hibbing, Minnesota, USA) 2
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/23664729976.html" target="_blank"><img src="http://farm1.static.flickr.com/696/23664729976_ef9244a125_m.jpg" alt="" /></a><br />Biwabik Iron-Formation (Paleoproterozoic, ~1.878 Ga; southern wall of the Hull-Rust-Mahoning Mine, Hibbing, Minnesota, USA) 2 / James St. John</span>

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Faulted metamorphosed pillow basalt (Ely Greenstone, Neoarchean, ~2.722 Ga; Rt. 169 roadcut just east of Ely, Minnesota, 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/21527030545.html" target="_blank"><img src="http://farm1.static.flickr.com/637/21527030545_4c6bb822f7_m.jpg" alt="" /></a><br />Faulted metamorphosed pillow basalt (Ely Greenstone, Neoarchean, ~2.722 Ga; Rt. 169 roadcut just east of Ely, Minnesota, USA) 4 / James St. John</span>

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Kyanitic eclogite (Arguvan District, Malatya Province, Turkey) 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/52763474076.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52763474076_06e28284ff_m.jpg" alt="" /></a><br />Kyanitic eclogite (Arguvan District, Malatya Province, Turkey) 4 / James St. John</span>

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Chromitite in serpentinite (Neoarchean; North Star Mine, Red Lodge Chromite District, Beartooth Mountains, Montana, 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/52477005613.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52477005613_b98c7d3c93_m.jpg" alt="" /></a><br />Chromitite in serpentinite (Neoarchean; North Star Mine, Red Lodge Chromite District, Beartooth Mountains, Montana, USA) 3 / James St. John</span>

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Black botryoidal hematite 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/51443102527.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51443102527_439deeda1d_m.jpg" alt="" /></a><br />Black botryoidal hematite 3 / James St. John</span>

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Asymmetrical ripple marks in quartzite (Baraboo Quartzite, upper Paleoproterozoic, ~1.7 Ga; southern shore of Devil's Lake, Devil's Lake State Park, Wisconsin, 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/18200155544.html" target="_blank"><img src="http://farm4.static.flickr.com/3790/18200155544_95a9bd5ff5_m.jpg" alt="" /></a><br />Asymmetrical ripple marks in quartzite (Baraboo Quartzite, upper Paleoproterozoic, ~1.7 Ga; southern shore of Devil's Lake, Devil's Lake State Park, Wisconsin, USA) 4 / James St. John</span>

サイズ変更など

Cross-bedding in quartzite (Baraboo Quartzite, upper Paleoproterozoic, ~1.7 Ga; Tumbled Rocks Trail, Devil's Lake State Park, Wisconsin, 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/18194318804.html" target="_blank"><img src="http://farm1.static.flickr.com/267/18194318804_fffa36d178_m.jpg" alt="" /></a><br />Cross-bedding in quartzite (Baraboo Quartzite, upper Paleoproterozoic, ~1.7 Ga; Tumbled Rocks Trail, Devil's Lake State Park, Wisconsin, USA) 8 / James St. John</span>

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Bastite (apparently) (Neoarchean; Red Lodge Chromite District, Beartooth Mountains, Montana, 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/52574254837.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52574254837_45b3c1ac09_m.jpg" alt="" /></a><br />Bastite (apparently) (Neoarchean; Red Lodge Chromite District, Beartooth Mountains, Montana, USA) 4 / James St. John</span>

サイズ変更など

Faulted metamorphosed pillow basalt (Ely Greenstone, Neoarchean, ~2.722 Ga; Rt. 169 roadcut just east of Ely, Minnesota, USA) 2
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/20905900193.html" target="_blank"><img src="http://farm1.static.flickr.com/751/20905900193_87432280db_m.jpg" alt="" /></a><br />Faulted metamorphosed pillow basalt (Ely Greenstone, Neoarchean, ~2.722 Ga; Rt. 169 roadcut just east of Ely, Minnesota, USA) 2 / James St. John</span>

サイズ変更など

Baraboo Quartzite (upper Paleoproterozoic, ~1.7 Ga; just north of Rock Springs, Wisconsin, 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/18780805732.html" target="_blank"><img src="http://farm1.static.flickr.com/492/18780805732_2e7fec80d7_m.jpg" alt="" /></a><br />Baraboo Quartzite (upper Paleoproterozoic, ~1.7 Ga; just north of Rock Springs, Wisconsin, USA) 4 / James St. John</span>

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Eclogite (Late Silurian to Early Devonian, ~400-423 Ma; Nordfjord area, Sogn og Fjordane County, Norway) 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/49075089396.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/49075089396_23d1f52ece_m.jpg" alt="" /></a><br />Eclogite (Late Silurian to Early Devonian, ~400-423 Ma; Nordfjord area, Sogn og Fjordane County, Norway) 9 / James St. John</span>

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Ordinary chondrite (Viñales Meteorite) 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/50439331011.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50439331011_8da4e7599e_m.jpg" alt="" /></a><br />Ordinary chondrite (Viñales Meteorite) 23 / James St. John</span>

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