Pottsville Group over Maxville Limestone (East Fultonham Pit, Muskingum County, Ohio, USA) 1 : 無料・フリー素材/写真
Pottsville Group over Maxville Limestone (East Fultonham Pit, Muskingum County, Ohio, USA) 1 / 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 Maxville Limestone is the only Middle to Late Mississippian-aged stratigraphic unit in Ohio. Its outcrop belt is not extensive - it principally occurs in Muskingum County and Perry County in eastern and southeastern Ohio. The Maxville Formation can also be found as cobbles and pebbles in the basal Sharon Formation (Lower Pennsylvanian), which disconformably overlies Ohio's Mississippian rocks. Paleohills, or erosional outliers, of Maxville Limestone have also been identified.Shown here is the working wall at an active quarry in Muskingum County, Ohio. The quarry targets Maxville Limestone and crushes it for use as road gravel, fill, rip-rap, and erosion-control blocks.The light-colored rocks in the lower half of the photo are the uppermost-preserved Maxville Limestone. The darker-colored rocks above that are part of the Early to Middle Pennsylvanian-aged Pottsville Group, a succession of mixed siliciclastics, coal, chert/flint, and limestone.The Maxville-Pottsville contact here is the Mississippian-Pennsylvanian unconformity - in this case, a disconformity (= horizontal sedimentary rocks atop horizontal sedimentary rocks). This erosion surface is one of the most significant unconformities in the Phanerozoic of North America. It is the boundary between two megasequences, the Kaskaskia Megasequence below and the Absaroka Megasequence above. Megasequences are also called Sloss Sequences, after the geologist Larry Sloss - www.geosociety.org/gsatoday/archive/24/3/pdf/i1052-5173-2...).The Maxville is 22 to 26 feet thick at this site. Rocks range from fossiliferous limestones (= moderately fine-grained, fossiliferous wackestones) to fossiliferous argillaceous limestone to fossiliferous calcareous shale. About 60 to 80 feet worth of Pottsville Group overburden has to be stripped away to access the Maxville Limestone interval.Stratigraphy: lower Pottsville Group (upper Lower Pennsylvanian) over Maxville Limestone (Meramecian to Chesterian, Middle to Upper Mississippian)Locality: East Fultonham Quarry (Shelly Materials, Incorporated), western side of Rt. 345/Saltillo Road, southwest of the town of East Fultonham & south-southeast of the town of Fultonham, southwestern Newton Township, far-southwestern Muskingum County, eastern Ohio, USA (39° 50' 50.76" North latitude, 82° 08' 08.73" West longitude - this portion of the quarry has since been filled in) |
| 撮影日 | 2011-09-26 14:22:36 |
| 撮影者 | James St. John |
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