Apparent hardground (probably from the Waldron Shale, Middle Silurian; St. Paul Stone Quarry, St. Paul, Indiana, USA) 6 : 無料・フリー素材/写真
Apparent hardground (probably from the Waldron Shale, Middle Silurian; St. Paul Stone Quarry, St. Paul, Indiana, USA) 6 / 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 | Apparent hardground in the Silurian of Indiana, USA.The St. Paul Stone Quarry in St. Paul, Indiana, USA has four Middle Paleozoic stratigraphic units exposed along the walls:Geneva Dolomite Member of the Jeffersonville Limestone (Lower Devonian)---------------------------------------------Louisville Limestone (Middle Silurian)---------------------------------------------Waldron Shale (Middle Silurian)---------------------------------------------Laurel Member of the Salamonie Dolomite (Middle Silurian)The rock shown above is a loose quarry block that probably derives from the Middle Silurian Waldron Shale. Its upper surface is somewhat smoothly sculpted - the classic appearance of a hardground. Hardgrounds are synsedimentarily cemented seafloors. Encrusting fossil organisms and borings are often found on hardground surfaces. This sample appears to be lacking a fossil hardground biota.Stratigraphy: Waldron Shale, upper Niagaran Series (upper Wenlockian), Middle SilurianLocality: St. Paul Stone Quarry, 1 mile northwest of the town of St. Paul & 1.75 miles southeast of the town of Waldron, southeastern Shelby County, southeast-central Indiana, USA (39° 26' 09.22" North, 85° 38' 38.66" West) |
| 撮影日 | 2015-10-03 08:58:34 |
| 撮影者 | James St. John |
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