File:Ironstone concretion (Lower Mercer Ore, Middle Pennsylvanian; Rt. 16 roadcut near Trinway, Ohio, USA) 1 (24621692408).jpg
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| Description |
The Lower Mercer Limestone is a Middle Pennsylvanian-aged, laterally persistent, marine fossiliferous limestone unit in the Pottsville Group of eastern Ohio, USA. It is richly fossiliferous, principally dominated by brachiopods and crinoid stems. Just above the Lower Mercer Limestone is a variably-developed nodular ironstone horizon historically called the Lower Mercer Ore (a.k.a. Little Red Block Ore). The nodules are principally composed of siderite (= FeCO3 - iron carbonate). Oxidized samples are often reddish to yellowish to brownish from various iron oxides (hematite, limonite, etc.). The ironstone concretion shown here is vermiform and may have originally been a marine invertebrate burrow. Stratigraphy: Lower Mercer Ore (just above the Lower Mercer Limestone), Pottsville Group, lower Atokan Stage, lower Middle Pennsylvanian Locality: roadcut along the northern side Rt. 16, southern margin of Irish Ridge, west of the Rt. 16-Rt. 60 intersection, northwest of the town of Trinway, northwestern Muskingum County, eastern Ohio, USA (40° 09’ 12.95” North latitude, 82° 02’ 43.27” West longitude) |
| Date | |
| Source | Ironstone concretion (Lower Mercer Ore, Middle Pennsylvanian; Rt. 16 roadcut near Trinway, Ohio, USA) 1 |
| 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@N05/24621692408 (archive). It was reviewed on 8 October 2019 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 | 12:08, 8 October 2019 | | 3,632 × 2,239 (5.69 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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