Charcoal debris horizon in bituminous coal (Lower Mercer Coal, Pottsville Group, Pennsylvanian; Rt. 93 roadcut north of Mt. Pleasant, Hocking County, Ohio, USA) 5 : 無料・フリー素材/写真
Charcoal debris horizon in bituminous coal (Lower Mercer Coal, Pottsville Group, Pennsylvanian; Rt. 93 roadcut north of Mt. Pleasant, Hocking County, Ohio, USA) 5 / 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 | Charcoal debris horizon in bituminous coal from the Pennsylvanian of Ohio, USA.This fossiliferous coal sample is from the Pottsville Group of eastern Ohio. The Pottsville Group is a Pennsylvanian-aged cyclothemic succession containing 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 Limestone horizon (?).This is a sample of weathered bituminous coal with abundant pieces of compressed fossil charcoal (= blackish-colored chunks). The Pennsylvanian was a time of relatively high atmospheric oxygen (O2) levels, and forest fires were relatively common events. Charcoalized fossil wood can be found in some abundance in Pennsylvanian sedimentary successions. The original wood microstructure is usually well preserved, but the charcoal fragments themselves are quite delicate. A gentle rub with a finger turns these fragments into black powder.Stratigraphy: float apparently derived from the Lower Mercer Coal (= Number 3 Coal), just below the Boggs Limestone, middle Pottsville Group, lower Atokan Stage, lower Middle PennsylvanianLocality: loose piece near the base of Mt. Pleasant North Outcrop - roadcut on the eastern side of Rt. 93, just north of the town of Mt. Pleasant, southern Washington Township, southern Hocking County, southeastern Ohio, USA (39° 23' 51.35" North latitude, 82° 27' 14.15" West) |
| 撮影日 | 2015-10-17 13:55:28 |
| 撮影者 | James St. John |
| タグ | |
| 撮影地 |