File:Stereospyroceras sp. (fossil cephalopod) in limestone (Champlain Black Marble) (Crown Point Limestone, Middle Ordovician; Vermont, USA) 2.jpg
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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 fossil is a straight-shelled nautiloid, a group of squid-like creatures that constructed aragonitic (CaCO3 - calcium carbonate), hollow shells with regularly-spaced internal walls. In the fossil record, the original aragonite shell has usually dissolved away, leaving an internal mold (an impression of the shell's interior). Nautiloids were relatively common components of Paleozoic oceans. Most species had straight, slightly tapering shells, but some had loosely coiled or tightly coiled shells. The entire group is represented in today's oceans by five living species of chambered nautilus, all of which have a coiled shell: Nautilus pompilius, Nautilus macromphalus, Nautilus stenomphalus, Nautilus belauensis, and Allonautilus scrobiculatus. Shown here is Stereospyroceras sp., an Ordovician nautiloid that had annulations on its shell - these are represented by the scallops along the margin of the fossil. Classification: Animalia, Mollusca, Cephalopoda, Nautiloidea, Orthocerida, Proteoceratidae 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@N05/41790849702/ |
| 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@N05/41790849702. 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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| current | 01:10, 12 March 2020 | | 3,652 × 1,973 (4.69 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/41790849702/ with UploadWizard |
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