File:Ironstone in quartz-pebble conglomerate (Sharon Conglomerate, Lower Pennsylvanian; Jackson North roadcut, Ohio, USA) 8 (37711921382).jpg
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[edit]DescriptionIronstone in quartz-pebble conglomerate (Sharon Conglomerate, Lower Pennsylvanian; Jackson North roadcut, Ohio, USA) 8 (37711921382).jpg |
Ironstone in conglomerate in the Pennsylvanian of Ohio, USA. This outcrop in southern Ohio exposes the lowermost Pottsville Group, a Pennsylvanian-aged, cyclothemic succession in eastern Ohio that contains nonmarine shales, marine shales, siltstones, sandstones, coals, marine limestones, and chert ("flint"). The lower Pottsville dates to the late Early Pennsylvanian. The upper part dates to the early Middle Pennsylvanian. The Lower-Middle Pennsylvanian boundary is apparently somewhere near the Boggs Member (?). At this site, the basal Pottsville is a spectacular quartz-pebble conglomerate, with a quartzose sandstone unit above it, plus coal and shale above that. The latter two units are visible, but not easily accessible for examination. In eastern and northeastern Ohio, the conglomeratic base of the Pottsville Group is called the Sharon Conglomerate (a.k.a. Sharon Sandstone; Sharon Formation; Sharon Member). The literature points out that the Sharon elsewhere in Ohio is not directly correlatable with the conglomerate exposed at this site near Jackson, Ohio. Thus, it has been suggested that the unit at this locality be referred to as the "Sharon" Conglomerate. Here, the rocks are generally massive (= non-bedded) quartz-pebble conglomerates. Other clast lithologies and sizes are also present, including angular shale clasts, angular sandstone clasts (both derived from erosion of the underlying Logan Formation of Early Mississippian age), rounded to irregularly-shaped ironstone clasts, rounded quartz sandstone pebbles, rounded quartzite pebbles, and rounded silicified limestone pebbles. A very unusual clast type present at this outcrop is ferruginous, pyrite-cemented and hematite-cemented, quartz-pebble conglomerate (= conglomerate in conglomerate ! ). The rusty brown-colored material in the middle of this photo is an ironstone paleoclast. Only a rind is present, due to erosion of the rest of the clast. The remainder of the clast may not have been entirely ironstone. Ironstone-rimmed mudshale clasts have been observed elsewhere at this site. Stratigraphy: "Sharon" Conglomerate, lowermost Pottsville Group, Lower Pennsylvanian Locality: Jackson North Outcrop - roadcut along the southwestern side of Rt. 35, immediately southeast of the Rt. 35-Lloyds Bridge Road intersection (the northwestern intersection - there are two of them), north of the town of Jackson, northwest-central Jackson County, southern Ohio, USA (39° 06’ 32.94” North latitude, 82° 40’ 39.99” West longitude) |
Date | |
Source | Ironstone in quartz-pebble conglomerate (Sharon Conglomerate, Lower Pennsylvanian; Jackson North roadcut, Ohio, USA) 8 |
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@N05/37711921382 (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. |
8 October 2019
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current | 05:49, 8 October 2019 | ![]() | 4,000 × 3,000 (5.22 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Camera manufacturer | Canon |
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F-number | f/8 |
ISO speed rating | 80 |
Date and time of data generation | 09:13, 30 September 2017 |
Lens focal length | 6.2 mm |
Image title | |
Width | 4,000 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 | 22:25, 14 October 2017 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 09:13, 30 September 2017 |
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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 | 18:25, 14 October 2017 |
Unique ID of original document | 9A1E88ED821F6BB8E06A575B7D018C50 |
IIM version | 18,755 |