File:Oolitic ironstone (Brassfield Formation, Lower Silurian; Ohio Brush Creek roadcut, southern Ohio, USA) 2 (36628757221).jpg
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[edit]DescriptionOolitic ironstone (Brassfield Formation, Lower Silurian; Ohio Brush Creek roadcut, southern Ohio, USA) 2 (36628757221).jpg |
Oolitic ironstone in the Silurian of Ohio, USA. This is a scarce sedimentary lithology - oolitic ironstone. The rocks are a bit more complicated that even that, however. The dominant grains are rounded oolites and peloids composed of rusty brown to reddish-brown to yellowish-brown iron oxides. The oolites are cemented together with calcite (CaCO3 - calcium carbonate). Macrofossils are common - mostly brachiopods, but other typical Paleozoic shallow marine invertebrates are also present. The fossils are usually irregularly-shaped, gray-colored clasts. These unusual rocks come 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). Stratigraphy: crack samples of talus derived from the Brassfield Formation, Llandoverian Series, Lower Silurian Locality: Ohio Brush Creek outcrop - roadcut on the western side of Rt. 41, immediately south of the Ohio Brush Creek bridge, southwest of Peebles & northeast of West Union, north-central Adams County, southern Ohio, USA (38° 53' 36.54" North latitude, 83° 27' 11.27" West longitude) |
Date | |
Source | Oolitic ironstone (Brassfield Formation, Lower Silurian; Ohio Brush Creek roadcut, southern 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@N05/36628757221 (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/Time | Thumbnail | Dimensions | User | Comment | |
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current | 03:03, 6 December 2019 | 2,409 × 2,317 (5.13 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Camera manufacturer | Canon |
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Exposure time | 1/200 sec (0.005) |
F-number | f/10 |
ISO speed rating | 80 |
Date and time of data generation | 11:30, 9 July 2017 |
Lens focal length | 9.681 mm |
Image title | |
Width | 4,000 px |
Height | 3,000 px |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 21:46, 23 August 2017 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 11:30, 9 July 2017 |
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Image compression mode | 3 |
APEX shutter speed | 7.65625 |
APEX aperture | 6.65625 |
APEX exposure bias | −0.33333333333333 |
Maximum land aperture | 3.625 APEX (f/3.51) |
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Flash | Flash did not fire, auto mode |
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Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Portrait |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 17:46, 23 August 2017 |
Unique ID of original document | CF36B95AC9A783BC12F3606C1CB16640 |