Teepee Canyon Agate (Teepee Canyon, South Dakota, USA) 8 : 無料・フリー素材/写真
Teepee Canyon Agate (Teepee Canyon, South Dakota, USA) 8 / 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 | Agate ("Teepee Canyon Agate") from the Black Hills of South Dakota, USA. (public display, South Dakota School of Mines Museum of Geology, Rapid City, South Dakota, USA)"Agate" is a rockhound/collector term for cavities in rocks (usually sedimentary rocks such as limestone or igneous rocks such as basalt) that have been partially or completely filled with irregularly concentric layers of microcrystalline, fibrous quartz (chalcedony - SiO2). Agate is quartz.Teepee Canyon Agate is derived from limestones of the Minnelusa Formation (Upper Pennsylvanian to Lower Permian), which outcrops in the Black Hills.Locality: Teepee Canyon, Black Hills, Custer County, western South Dakota, USA |
| 撮影日 | 2012-05-25 11:37:27 |
| 撮影者 | James St. John |
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