File:Rugose corals in fossiliferous limestone (Middle Devonian) 1 (40459063713).jpg
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| Description |
Limestone is the third most common sedimentary rock in the world. It is a biogenic sedimentary rock composed of the mineral calcite (CaCO3 - calcium carbonate). Calcite and limestone are readily identified by bubbling in acid. Numerous varieties of limestone exist. Seen here is a common type called "fossiliferous limestone", which has a mix of whole fossils, fragmented fossils, and fine-grained matrix. The large gray fossils in the rock are rugose corals, commonly called "horn corals". Rugosans are an extinct group - they only occur in Paleozoic rocks. The soft parts were sea anemone-like creatures called polyps. The polyps made calcareous hard-part skeletons. Most rugosans were solitary, but some were colonial. Solitary rugose corals are present here - they have solid, tapering skeletons of calcite. Erosion has exposed some of the internal structure in these specimens. Classification: Animalia, Cnidaria, Anthozoa, Rugosa Stratigraphy: undetermined, but possibly from the Columbus Limestone, Middle Devonian Provenance: unknown, but probably from Ohio, USA Locality: border block at edge of gravel parking lot, Hebron Evans Park, southern Licking County, east-central Ohio, USA See info. at: <a href="https://en.wikipedia.org/wiki/Rugosa" rel="noreferrer nofollow">en.wikipedia.org/wiki/Rugosa</a> |
| Date | |
| Source | Rugose corals in fossiliferous limestone (Middle Devonian) 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@N05/40459063713. It was reviewed on 5 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 | 03:31, 5 December 2019 | | 4,000 × 3,000 (8.52 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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