File:Fossiliferous limestone & kukersite (Viivikonna Formation, Middle Ordovician; Kohtla-Järve, Estonia).jpg

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English: Fossiliferous limestone from the Ordovician of Estonia.

The light gray material seen here is fossiliferous limestone, a biogenic sedimentary composed of calcite (CaCO3 - calcium carbonate). The brown material is kukersite, a variety of oil shale (although lithologically, this is not oil shale). Kukersite is a hydrocarbon-rich sedimentary rock that burns in a fire. Upon heating, kukersite releases petroleum.

Stratigraphy: "Estonia Deposit", Kiviõli Member, Viivikonna Formation, Kukruse Stage, Middle Ordovician (sensu traditio)

Locality: unrecorded/undisclosed site at or near the town of Kohtla-Järve, northeastern Estonia

See info. at:

en.wikipedia.org/wiki/Kukersite
Date
Source https://www.flickr.com/photos/47445767@N05/50786942096/
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/50786942096. It was reviewed on 4 January 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

4 January 2021

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current14:46, 4 January 2021Thumbnail for version as of 14:46, 4 January 20213,424 × 2,532 (6.2 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50786942096/ with UploadWizard

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