Geode (Fort Payne Formation, Lower Mississippian; Rt. 61 roadcut, north of Burkesville, Kentucky, USA) 3 : 無料・フリー素材/写真
Geode (Fort Payne Formation, Lower Mississippian; Rt. 61 roadcut, north of Burkesville, Kentucky, USA) 3 / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
|---|---|
| 説明 | Geodes are small to large, subspherical to irregularly-shaped, crystal-lined cavities in rocks. They form when water enters a void in a host rock and precipitates crystals. The most common geode-lining mineral is quartz.The uncracked geode shown here is from the Fort Payne Formation, a fossiliferous shale-and-limestone unit in the Lower Mississippian of Kentucky and Tennessee. Geodes are relatively common in this unit. Geode-lining minerals observed in this unit in this part of Kentucky include quartz, calcite, and dolomite.Stratigraphy: Fort Payne Formation, Osagean Stage/Series, upper Lower MississippianLocality: Burkesville North Outcrop - Route 61 roadcut at milepost 23, way north of Burkesville, Kentucky, USA. (36° 54’ 08.08” North latitude, 85° 25’ 56.19” West longitude) |
| 撮影日 | 2018-03-14 11:14:10 |
| 撮影者 | James St. John |
| タグ | |
| 撮影地 |