File:Silicified rugose coral (Middle Devonian; probably Ohio, USA) 5 (38112588125).jpg
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Summary[edit]
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| Description |
Silicified fossil coral from the Middle Devonian. (5.0 cm across at its widest) (lateral view; counter side at top; cardinal side at bottom) Replacement is a fossil preservation style involving the crystal structure and the mineral of an organism's hard parts being changed. The most common replacement mineral is quartz (silica) (SiO2) - fossils that have been replaced by quartz are said to be silicified (silicification). Many silicified fossils have rounded to pustulose structures covering their surfaces. These are called beekite rings, but they're composed of ordinary quartz. Other common replacment materials include the mineral pyrite (FeS2 - iron sulfide) and calcium phosphate. These replacement styles are called pyritization and phosphatization. Numerous other minerals have been found replacing minerals - many of them are quite rare. Reported fossil replacement minerals include: anglesite, apatite, barite, calamine, calcite, cassiterite, celestite, cerargyrite, cerussite, chalcocite, cinnabar, copper, dolomite, fluorite, galena, garnet, glauconite, gumbelite, gypsum, hematite, kaolinite, limonite, magnesite, malachite, marcasite, margarite, opal, pyrite, romanechite/psilomelane, siderite, silica/quartz, silver, smithsonite, specular hematite, sphalerite, sulfur, uranium minerals, and vivianite. (List mostly from info. in Hartzell, 1906 and Klein & Hurlbut, 1985) This fossil is a silicified rugose coral. Rugosans are an extinct group of corals - 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. This specimen has been geodized - it has a crystal-lined hollow inside. Some crystals have become detached. When shaken, the fossil rattles. Classification: Animalia, Cnidaria, Anthozoa, Rugosa Stratigraphy: undetermined, but possibly from the Columbus Limestone, Middle Devonian Locality: unrecorded, but probably from Ohio, USA See info. at: <a href="https://en.wikipedia.org/wiki/Rugosa" rel="noreferrer nofollow">en.wikipedia.org/wiki/Rugosa</a> |
| Date | |
| Source | Silicified rugose coral (Middle Devonian; probably Ohio, USA) 5 |
| 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@N05/38112588125 (archive). 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 | 03:30, 5 December 2019 | | 2,593 × 1,508 (2.59 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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