Minor thrust fault in interbedded fossiliferous limestones and shales (Fairview Formation, Upper Ordovician; upper cut, Maysville West roadcut, Kentucky, USA) 2 : 無料・フリー素材/写真
Minor thrust fault in interbedded fossiliferous limestones and shales (Fairview Formation, Upper Ordovician; upper cut, Maysville West roadcut, Kentucky, USA) 2 / 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 | Minor thrust fault developed in Ordovician interbedded limestones & shales in Kentucky, USA.This outcrop is in the famous Cincinnatian Series of the tristate area of Ohio-Kentucky-Indiana. Rocks in the Cincinnatian were deposited in relatively shallow marine facies during the Late Ordovician. The Cincinnatian succession is mostly interbedded limestones and shales - all richly fossiliferous. Most of the limestones are event beds (= tempestites), deposited during ancient storms.A subtle thrust fault is present here, from left to upper right. It is developed in the Bellevue Limestone and Fairview Formation. The fault acted as a conduit for groundwater, which dissolved out a small cave along the strike of the fault (see: www.flickr.com/photos/jsjgeology/31949022868). Thrust faults are low-angle reverse faults - they form by compressional stress. Thrust faults involve the hanging wall moving upward and the footwall moving downward.Stratigraphy: Fairview Formation, Maysvillian Stage, middle Cincinnatian Series, Upper OrdovicianLocality: Maysville West upper cut - roadcut on the southeastern side of Rt. 62/Rt. 68, just south of bridge over Lawrence Creek & south of the Harsha Bridge over the Ohio River, northern Kentucky, USA (~vicinity of 38° 40’ 04.23" North latitude, 83° 48' 07.08" West longitude) |
| 撮影日 | 2009-11-13 15:46:22 |
| 撮影者 | James St. John |
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