Mississippian-Pennsylvanian unconformity (Rt. 16 roadcut northeast of Frazeysburg, Ohio, USA) 7 : 無料・フリー素材/写真
Mississippian-Pennsylvanian unconformity (Rt. 16 roadcut northeast of Frazeysburg, Ohio, USA) 7 / 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 | This is a Mississippian-Pennsylvanian boundary section in eastern Ohio. At most sites in North America, the boundary is a significant unconformity - it's actually a megasequence boundary (Sloss sequence boundary) between the Absaroka Megasequence (above) and the Kaskaskia Megasequence (below). The boundary is along the middle of the photo.The cliff-forming unit in the middle part of the picture is a quartzose sandstone that represents the basal-preserved Pottsville Group at this locality. Mixed siliciclastics occur above. The sandstone unit is here interpreted to be the Massillon Sandstone, a variably-developed member in the lower to middle Pottsville Group.Laterally at this site, a relatively thin bituminous coal horizon is present just below the sandstone. The identity of this coal bed is uncertain, but it may be the Quakertown Coal (or Number 2 Coal), or an unnamed coal, or the Wellston Coal (a name from Jackson County, Ohio). If the sandstone unit is misidentified (i.e., it's not the Massillon), it could be the Sharon Sandstone. If so, the underlying coal is the Sharon Coal.The grayish rocks in the bottom half of the picture are siliciclastics of the Vinton Member, the uppermost of four members of the Logan Formation. The Vinton consists of marine mixed siliciclastics - principally shales, siltstones, and sandstones.Stratigraphy: inferred Massillon Sandstone (lower Pottsville Group, upper Lower Pennsylvanian) over Vinton Member, (upper Logan Formation, Osagean Series, upper Lower Mississippian)Locality: Trinway West 6 Outcrop - roadcut on the northwestern side of Rt. 16, 1.0 miles northeast of the Rt. 16-Old Riley Road intersection, northeast of the town of Frazeysburg & west of the town of Trinway, northwestern Muskingum County, Ohio, USA (40° 08' 41.54" North latitude, 82° 05' 06.18" West longitude) |
| 撮影日 | 2017-04-28 09:13:16 |
| 撮影者 | James St. John |
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