File:Volkonskoite-replaced fossil wood, Mt. Efimiatsk, Chastinsky District, Russia.jpg
原始文件 （2,860 × 2,098像素，文件大小：2.64 MB，MIME类型：image/jpeg）
摘要
| 描述 |
Volkonskoite-replaced fossil wood from the Permian of Russia. (4.9 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 This fossil wood has been replaced by a rare chromian smectite clay mineral called volkonskoite (Ca0.3(Cr,Mg,Fe)2(Si,Al)4O10 (OH)2⋅4H2O - hydrous calcium chromium magnesium iron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 Permian Locality: 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 |
| 日期 | |
| 来源 | Volkonskoite-replaced fossil wood (Upper Permian; Mt. Efimiatsk, Chastinsky District, foothills of the Ural Mountains, Russia) 8 |
| 作者 | James St. John |
许可协议
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这幅图片原始出处为Flickr的https://www.flickr.com/photos/47445767@N05/19001002448 ，作者为jsj1771 。经机器人FlickreviewR在2015年6月28日审查后确定为采用cc-by-2.0的协议授权使用。 |
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| 日期/时间 | 缩略图 | 大小 | 用户 | 备注 | |
|---|---|---|---|---|---|
| 当前 | 2015年6月28日 (日) 19:17 | | 2,860 × 2,098（2.64 MB） | Tillman | Transferred from Flickr via Flickr2Commons |
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