File:Fossil mound in limestone (Champlain Black Marble) (Crown Point Limestone, Middle Ordovician; Vermont, USA) 2.jpg
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Summary[edit]
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| Description |
English: "Champlain Black Marble" - fossiliferous limestone from the Ordovician of Vermont, USA.
In the commercial decorative stone trade, “marble” is used to refer to a wide variety of relatively soft rocks (H = 3 to 5) that will take a fine polish. These include true marbles and rocks that aren’t marbles, such as limestones, tectonic breccias, and serpentinites. True limestones are calcitic biogenic and ~chemical sedimentary rocks. The black material shown above is called "Champlain Black Marble", but is really Ordovician-aged limestone of the Crown Point Limestone. Decent-sized fossils are commonly encountered in this rock, such as gastropods, cephalopods, and bryozoan colonies. The gray-colored, irregularly-layered structure in the polished limestone tile seen here is a fossil mound ("reef"). Crown Point Limestone fossil mounds can be composed of various organisms, such as bryozoans, stromatoporoid sponges, and stromatolites (= layered bacterial structures). Stratigraphy: Crown Point Limestone, lower Middle Ordovician Provenance: attributed to a quarry in Vermont, USA (possibly from the Fisk Quarry or the Goodsell Quarry) Locality: floor paving stone in the Ohio Statehouse, downtown Columbus, Ohio, USA |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/41787123132/ |
| 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@N05/41787123132. It was reviewed on 12 March 2020 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 | |
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| current | 01:10, 12 March 2020 | | 3,287 × 2,753 (6.75 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/41787123132/ with UploadWizard |
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