File:Delaware Limestone over Columbus Limestone (Middle Devonian; Marblecliff Quarry, Hilliard, Ohio, USA) 4 (48384430566).jpg
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[edit]DescriptionDelaware Limestone over Columbus Limestone (Middle Devonian; Marblecliff Quarry, Hilliard, Ohio, USA) 4 (48384430566).jpg |
Limestones in the Devonian of Ohio, USA. Thin bedded limestones in upper part of photo = Delaware Limestone Thick-bedded limestones in lower part of photo = Columbus Limestone The Delaware and Columbus Limestones are significant carbonate units in the Devonian of central and northern Ohio. They're actually part of a much more widespread sheet of Devonian carbonates that extends from New York State to the Midwest. The two units represents deposition in a subtropical, shallow-water, carbonate platform environment. The rocks are principally micritic limestones, fossiliferous wackestones, and fossiliferous packstones. Some chert nodules are present in the Columbus Limestone. Fossils are typical Paleozoic shallow marine invertebrates - favositid corals, rugose corals, stromatoporoids, brachiopods, crinoids, blastoids, bryozoans, trilobites, bivalves, gastropods, cephalopods, rostroconchs, and tentaculites. Microfossils include conodonts and charophyte oogonia. Other fossils in the Columbus Limestone include vertebrates (fish), land plants (rare), and trace fossils. Some fossil horizons in the Columbus Limestone are partially silicified. The Columbus-Delaware contact is a prominent disconformity (= type II sequence boundary). Biostratigraphic studies show that one conodont biozone is missing at the contact contact in central Ohio, probably representing ~1 to 3 million years. The base of the Columbus Limestone (not seen in this photo) is a major, continent-wide unconformity representing the Tippecanoe-Kaskaskia megasequence boundary (= type I sequence boundary). The boundary bed is a bentonite (= altered volcanic ash bed) that has been correlated with the Tioga Bentonite of New York State. Stratigraphy: basal Delaware Limestone (Eifelian to Givetian Stages, Middle Devonian) over uppermost Columbus Limestone (Eifelian Stage, lower Middle Devonian) Locality: roadcut along access road on the northern margin of Marblecliff Quarry (Martin Marietta Aggregates), just east of the guardhouse, west of the Scioto River & east of Dublin Road, Hilliard, northwestern Franklin County, central Ohio, USA (40° 00’ 55.74” North latitude, 83° 05’ 58.78” West longitude) |
Date | |
Source | Delaware Limestone over Columbus Limestone (Middle Devonian; Marblecliff Quarry, Hilliard, Ohio, USA) 4 |
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@N05/48384430566 (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. |
12 October 2019
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current | 04:37, 12 October 2019 | 1,799 × 1,199 (2.94 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Width | 1,799 px |
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Height | 1,199 px |
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Compression scheme | Uncompressed |
Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Data arrangement | chunky format |
Software used | Adobe Photoshop Elements 16.0 (Macintosh) |
File change date and time | 22:47, 26 July 2019 |
Exif version | 2.21 |
Color space | sRGB |
Unique ID of original document | uuid:1A3A3F1A897711DB9BA0CFE3604FD80E |
Date and time of digitizing | 19:26, 9 December 2006 |
Date metadata was last modified | 18:47, 26 July 2019 |
Copyright status | Copyright status not set |