File:Geode (lower Warsaw Formation, Lower Mississippian; Warsaw, Hancock County, Illinois, USA) (41598898692).jpg
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| Description |
Quartz geode from the Mississippian of Illinois, USA. (public display, Geology Department, Wittenberg University, Springfield, Ohio, USA) Geodes are small to large, subspherical to irregularly-shaped, crystal-lined cavities in rocks. They form when water enters a void in a host rock and precipitates crystals. The most common geode-lining mineral is quartz, as in this Illinois example. Stratigraphy: derived from dolostone or dolomitic limestone of the lower member of the Warsaw Formation, Osagean Stage, upper Lower Mississippian Locality: unrecorded/undisclosed site at or near Warsaw, far-western Hancock County, far-western Illinois, USA |
| Date | |
| Source | Geode (lower Warsaw Formation, Lower Mississippian; Warsaw, Hancock County, Illinois, USA) |
| 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@N05/41598898692. 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 | 02:07, 5 December 2019 | | 1,816 × 1,605 (2.14 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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