File:Composite ironstone concretion (gravel bar clast, Chatham, Ohio, USA) 1 (40359493525).jpg

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This rock is from a gravel bar along a creek at Chatham, Ohio. It was eroded from local or near-local Mississippian-aged bedrock - probably from the Logan Formation (Osagean Stage, upper Lower Mississippian).

The sample is composed of over a dozen small to medium-sized, subspherical ironstone nodules (= iron oxide rock). They have become cemented together by a crust of the same iron oxide material.

Provenance: modern fluvial clast derived from Pleistocene glacial drift

Locality: gravel bar on the western side of the town of Chatham, northern Licking County, east-central Ohio, USA
Date
Source Composite ironstone concretion (gravel bar clast, Chatham, Ohio, USA) 1
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@N05/40359493525 (archive). It was reviewed on 6 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

6 December 2019

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Date/TimeThumbnailDimensionsUserComment
current03:03, 6 December 2019Thumbnail for version as of 03:03, 6 December 20192,864 × 1,956 (3.07 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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