File:Pyrite atop chert nodule (Delaware Limestone, Middle Devonian; Emerald Parkway roadcut, Dublin, Ohio, USA) 1 (27317902147).jpg
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The Delaware Limestone is a significant carbonate unit in the Devonian of central and northern Ohio. It's actually part of a much more widespread sheet of Devonian carbonates that extends from New York State to the Midwest. The Delaware Limestone represents deposition in a subtropical, shallow-water, carbonate platform environment. The rocks are principally micritic limestones, fossiliferous wackestones, and fossiliferous packstones. Fossils are typical Paleozoic shallow marine invertebrates. The thin-bedded Delaware Limestone is underlain by the thick-bedded Columbus Limestone (also Devonian). The contact is a prominent disconformity (a type II sequence boundary). Biostratigraphic studies have shown that one conodont biozone is missing at the Columbus-Delaware contact in central Ohio, probably representing ~1 to 3 million years. The Delaware Limestone is overlain by soft gray clayshales of the Olentangy Shale (lower Upper Devonian). At the center of the photo is a chert nodule, hosted in limestone. Directly above the chert nodule is a mass of pyrite ("fool's gold") - FeS2 (iron sulfide). Oxidative weathering of the pyrite has resulted in reddish-brown, iron oxide weathering stains Stratigraphy: lower Delaware Limestone, Eifelian Stage, lower Middle Devonian Locality: roadcut along the southern side of Emerald Parkway, immediately east of Rt. 257 intersection, Dublin, northwestern Franklin County, central Ohio, USA (40° 06' 34.79" North latitude; 83° 06' 35.73" West longitude) |
| Date | |
| Source | Pyrite atop chert nodule (Delaware Limestone, Middle Devonian; Emerald Parkway roadcut, Dublin, Ohio, 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@N05/27317902147 (archive). 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 | 19:07, 7 December 2019 | | 4,000 × 3,000 (6.25 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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