File:Symmetrical ripple marks (Berea Sandstone, Upper Devonian-Lower Mississippian; Blendon Woods Park, Columbus, Ohio, USA) 2 (35455646600).jpg
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| Description |
Symmetrically-rippled quartzose sandstone from the Paleozoic of Ohio, USA. (outdoor display slab near visitor center, Blendon Woods Park, Columbus, Ohio, USA) Symmetrical ripples are moderately common sedimentary structures. In cross-section, when viewed perpendicular to the crests of the ripples, symmetrical ripple marks are more or less evenly shaped - they are symmetrical. Their presence in sedimentary rocks is diagnostic of deposition in a shallow water environment with a two-directional, back-and-forth (oscillatory) current. Symmetrical ripples marks are common in ancient shallow-water sandstone facies. This sample is from the Berea Sandstone of Ohio. It caps a coarsening-upward succession that starts with the Olentangy Shale, followed by the Ohio Shale, the Bedford Shale, and the Berea Sandstone. The Ohio Shale and Bedford Shale are Famennian in age (= upper Upper Devonian). Traditionally, the Bedford and the Berea have been considered as Lower Mississippian. The Berea is now known to be Famennian (~latest Devonian), based on palynomorph microfossils. The Devonian-Mississippian boundary may lie within the Berea Sandstone. A Kinderhookian-aged conulariid has been found in the basal part of the overlying Sunbury Shale. The Berea Sandstone has been quarried as building stone in northeastern Ohio. Stratigraphy: Berea Sandstone, upper Famennian Stage to lower Kinderhookian Stage (?), upper Upper Devonian to lower Lower Mississippian (?) Locality: derived from stream-cut ravine in Blendon Woods Park, Columbus, northeastern Franklin County, central Ohio, USA |
| Date | |
| Source | Symmetrical ripple marks (Berea Sandstone, Upper Devonian-Lower Mississippian; Blendon Woods Park, Columbus, Ohio, USA) 2 |
| 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@N05/35455646600. It was reviewed on 7 December 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 | 19:04, 7 December 2019 | | 4,000 × 3,000 (5.05 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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