File:Marlstone aggregate concretion (Sault Ste. Marie, Michigan, USA.JPG
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Summary
| Description |
Marlstone (lime-clay) aggregate concretion from Sault Ste. Marie, eastern Upper Peninsula of Michigan, USA (public display, Field Museum of Natural History, Chicago, Illinois, USA). Concretions are post-depositional structures found in some sedimentary successions, particularly in shales. They vary in mineralogy, size, and shape, but often have slightly flattened spheroidal shapes. They typically form by post-depositional mineralization around some nucleus (a rock fragment or fossil fragment). |
| Date | |
| Source | Marlstone aggregate concretion (Sault Ste. Marie, Michigan, USA) 2 |
| Author | James St. John |
Licensing
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@N05/15117271696. It was reviewed on 11 May 2020 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 | 06:06, 11 May 2020 | | 1,906 × 1,846 (1.71 MB) | Tillman | Transferred from Flickr via #flickr2commons |
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