Marlstone_aggregate_concretion_(Sault_Ste._Marie,_Michigan,_USA.JPG
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Summary
Description Marlstone aggregate concretion (Sault Ste. Marie, Michigan, USA.JPG |
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 |
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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. |
11 May 2020