File:Faulted Fort Payne Formation (Lower Mississippian; Rt. 61 roadcut, north of Burkesville, Kentucky, USA) 1 (46530016932).jpg
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Summary
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| Description |
The Fort Payne Formation of southern Kentucky & Tennessee is a shale and limestone succession of Early Mississippian age. Fossils are common to abundant in many intervals. The unit is dominated by crinoids. Other marine fossils here include brachiopods, bryozoans, and corals. The curving gash in the rocks at left of center is a fault. Another one is at right of center. Faults are fractures or fracture systems in rocks along which there has been differential displacement. Faults are produced by either extensional stress, compressional stress, or shear stress. Movement along faults is usually in the form of sudden jolts, which produces earthquakes. Prima facie, this appears to be a listric fault - a curving, concave-upward, normal fault. It may be. Click on the photo to zoom in and trace the fault - it becomes convex-upward in the upper left portion of the picture. Also notice the small splay at left. The dip angle of the fault plane here appears to change with the competency of the host rocks - it's low angle in the incompetent shales at the bottom and higher angle in the more competent limestones above. Stratigraphy: Fort Payne Formation, Osagean Stage/Series, upper Lower Mississippian Locality: Burkesville North Outcrop - Route 61 roadcut at milepost 23, way north of Burkesville, Kentucky, USA. (36° 53’ 48.51” North latitude, 85° 25’ 41.08” West longitude) |
| Date | |
| Source | Faulted Fort Payne Formation (Lower Mississippian; Rt. 61 roadcut, north of Burkesville, Kentucky, USA) 1 |
| Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/46530016932 (archive). It was reviewed on 12 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 04:09, 12 October 2019 | | 4,000 × 2,793 (5.29 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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