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File:Fossil wood (Valentine Formation, Miocene; Great Plains, USA) 1.jpg

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English: (outdoor public display, Ashfall Fossil Beds State Historical Park, Nebraska, USA)

This is "petrified wood", a horrible term for what is actually called permineralization. Biogenic materials such as wood or bone have a fair amount of small-scale porosity. After burial, the porosity of wood or bone can get partially or completely filled up with minerals as groundwater or diagenetic fluids percolate through. The end result is a harder, denser material that retains the original three-dimensionality (or close to it). The wood or bone has become “petrified”. Well, no - it’s become permineralized. Not surprisingly, the most common permineralization mineral is quartz (SiO2). Sometimes, wood and bone have been permineralized with radioactive minerals such as black uraninite (UO2) or yellowish carnotite (K2(UO2)2(VO4)2·3H2O).

Stratigraphy: Crookston Bridge Member, Valentine Formation, Miocene, ~13 Ma

Locality: undisclosed, but possibly from Nebraska, USA
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Source https://www.flickr.com/photos/47445767@N05/52268545921/
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@N05/52268545921. It was reviewed on 12 November 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

12 November 2022

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current19:11, 12 November 2022Thumbnail for version as of 19:11, 12 November 20223,008 × 1,748 (3.75 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/52268545921/ with UploadWizard

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