Lower Mercer Limestone over Middle Mercer Coal (Middle Pennsylvanian; Rock Cut railroad cut, south-southeast of Dresden, Ohio, USA) 3 : 無料・フリー素材/写真
Lower Mercer Limestone over Middle Mercer Coal (Middle Pennsylvanian; Rock Cut railroad cut, south-southeast of Dresden, Ohio, 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 |
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| 説明 | The Pottsville Group is a Pennsylvanian-aged cyclothemic succession in eastern Ohio that contains nonmarine shales, marine shales, siltstones, sandstones, coals, marine limestones, and chert ("flint"). The lower Pottsville dates to the late Early Pennsylvanian. The upper part dates to the early Middle Pennsylvanian. The Lower-Middle Pennsylvanian boundary is apparently somewhere near the Boggs Member (?).The gray ledge in the middle of the photo is the Lower Mercer Limestone, a laterally persistent, marine fossiliferous limestone unit in the Pottsville Group of eastern Ohio, USA. The overlying rocks are shales and sandstones. Just below the Lower Mercer Limestone is a relatively thin coal bed (= just above the slope, mostly in the shadows - click on the photo to zoom in), the Middle Mercer Coal. It ranges from bituminous coal to semi-cannel coal to cannel coal to carbonaceous shale. At this site, it is principally a bituminous coal horizon, but there is a semi-cannel occurrence.Stratigraphy: Lower Mercer Limestone, Pottsville Group, lower Atokan Stage, lower Middle PennsylvanianLocality: Rock Cut railroad cut - outcrop along the southern side of Ohio Central Railroad tracks (west of milepost 134), ~southwest of Copeland Island & south-southeast of the town of Dresden, northern Muskingum County, eastern Ohio, USA (~vicinity of 40° 04’ 24.41” North latitude, ~81° 59’ 11.25” West longitude) |
| 撮影日 | 2017-02-25 14:00:45 |
| 撮影者 | James St. John |
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