Volkonskoite-replaced fossil wood (Upper Permian; Mt. Efimiatsk, Chastinsky District, foothills of the Ural Mountains, Russia) 7 : 無料・フリー素材/写真
Volkonskoite-replaced fossil wood (Upper Permian; Mt. Efimiatsk, Chastinsky District, foothills of the Ural Mountains, Russia) 7 / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | Volkonskoite-replaced fossil wood from the Permian of Russia. (4.75 cm across at its widest)This is a very rare specimen of fossil wood from Permian rocks in western Russia. Most fossil wood is preserved by quartz-permineralization or carbonization. This fossil wood has been replaced by a rare chromian smectite clay mineral called volkonskoite (Ca0.3(Cr,Mg,Fe)2(Si,Al)4O10 (OH)2⋅4H2O - hydrous calcium chromium magnesium iron hydroxy-aluminosilicate). The chromium (Cr) content gives the fossil its green coloration. The striations appear to be remnants of the original wood structure.Host rocks & age: soft fluvial sandstones, Kazanian to Tatarian Stages, upper Upper PermianLocality: Mt. Efimiatsk (Mt. Efimyatskaya), near the town of Efimyata, ~10 miles west of Votinsk Reservoir & ~30 miles southwest of Okhansk, Chastinsky District, southwestern Perm Region, western foothills of the southwestern Ural Mountains, western Russia |
| 撮影日 | 2015-06-26 17:14:07 |
| 撮影者 | James St. John |
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