File:Fossiliferous oolitic ironstone (Brassfield Formation, Lower Silurian; Bainbridge, Ross County, Ohio, USA) 2 (49190177042).jpg
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[edit]DescriptionFossiliferous oolitic ironstone (Brassfield Formation, Lower Silurian; Bainbridge, Ross County, Ohio, USA) 2 (49190177042).jpg |
Fossiliferous oolitic ironstone in the Silurian of Ohio, USA. (Orton Geology Museum, Ohio State University, Columbus, Ohio, USA) This is a scarce sedimentary lithology - fossiliferous oolitic ironstone. It consists of oolites and fossils (including a nice trilobite tail) composed of reddish brown iron oxide. This unusual rock comes from the Early Silurian-aged Brassfield Formation of Ohio. The Brassfield is a heterolithic unit dominated by limestones, dolostones, and shales. Other lithologies include cherty limestone, fossiliferous chert, and glauconitic chert. In the subsurface of eastern Ohio, the Brassfield's lateral equivalent is called the Clinton Sandstone, or Clinton Formation. The Clinton is an interbedded succession of quartzose sandstones and shales. The sandstones are frequently charged with economic volumes of petroleum (crude oil & natural gas). The Clinton is one of the most economically significant petroleum systems in all of Ohio (others being the Ordovician-aged Trenton Limestone of northwestern Ohio and the Cambro-Ordovician aged Knox-Rose Run interval). Oolitic ironstone also occurs in the Lower Silurian of New York State and Alabama. Stratigraphy: Brassfield Formation, Llandoverian Series, Lower Silurian Locality: unrecorded/undisclosed site at or near the town of Bainbridge, southwestern Ross County, southern Ohio, USA |
Date | |
Source | Fossiliferous oolitic ironstone (Brassfield Formation, Lower Silurian; Bainbridge, Ross County, Ohio, 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@N05/49190177042 (archive). It was reviewed on 9 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
9 December 2019
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current | 06:24, 9 December 2019 | 2,261 × 1,317 (2.39 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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File change date and time | 17:05, 8 December 2019 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 16:58, 6 April 2014 |
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Date metadata was last modified | 12:05, 8 December 2019 |
Unique ID of original document | DB0631860F9DE02A5CF1ACE638BF6067 |