File:Fossiliferous flint & fossiliferous limestone (Upper Mercer Limestone, Middle Pennsylvanian; Rock Cut railroad cut, south-southeast of Dresden, Ohio, USA) 1 (32501119264).jpg
![File:Fossiliferous flint & fossiliferous limestone (Upper Mercer Limestone, Middle Pennsylvanian; Rock Cut railroad cut, south-southeast of Dresden, Ohio, USA) 1 (32501119264).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/7/74/Fossiliferous_flint_%26_fossiliferous_limestone_%28Upper_Mercer_Limestone%2C_Middle_Pennsylvanian%3B_Rock_Cut_railroad_cut%2C_south-southeast_of_Dresden%2C_Ohio%2C_USA%29_1_%2832501119264%29.jpg/764px-thumbnail.jpg?20170624173806)
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[edit]DescriptionFossiliferous flint & fossiliferous limestone (Upper Mercer Limestone, Middle Pennsylvanian; Rock Cut railroad cut, south-southeast of Dresden, Ohio, USA) 1 (32501119264).jpg |
This is the Upper Mercer Limestone in the Pottsville Group, a Pennsylvanian-aged cyclothemic succession containing 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 (?). The Upper Mercer Limestone is a moderately laterally persistent, chertified limestone horizon in the Pottsville Group. It is often composed of black-colored chert/flint but can be dark bluish to bluish-black colored as well (the latter colors are referred to as "Nellie Blue Flint"). Upper Mercer Flint has light-colored fossils and fossil fragments that include fusulinid foraminifera, crinoid ossicles, and other Late Paleozoic normal marine fossils. Apparent phylloidal algae can also be present as squiggly lines. Non-chertified limestone is frequently present in the Upper Mercer horizon, although minor in volume. Limestone usually occurs along the outside portions of chert masses, but also in relatively small patches within the chert. In places, the Upper Mercer Flint/Limestone horizon is missing, usually removed by paleoerosion. American Indians sometimes used Upper Mercer Flint to make arrowheads and spear points and knife blades. "Flint Ridge Flint" (= Vanport Flint) was the most desirable source rock for these objects, but other chert horizons also attracted attention. The black material in the bottom part of the photo is fossiliferous, black flint. The grayish & light brownish material above is fossiliferous limestone. Stratigraphy: Upper Mercer Limestone, upper Pottsville Group, Atokan Stage, lower Middle Pennsylvanian Locality: Rock Cut railroad cut - large, loose talus block derived from outcrop along the southern side of Ohio Central Railroad tracks (west of milepost 134), ~southwest of Copeland Island & south-southeast of the town of Dresden, northern Muskingum County, eastern Ohio, USA (~vicinity of 40° 04’ 24.41” North latitude, ~81° 59’ 11.25” West longitude) |
Date | |
Source | Fossiliferous flint & fossiliferous limestone (Upper Mercer Limestone, Middle Pennsylvanian; Rock Cut railroad cut, south-southeast of Dresden, 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@N05/32501119264. It was reviewed on 24 June 2017 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
24 June 2017
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current | 17:38, 24 June 2017 | ![]() | 3,812 × 2,992 (5.38 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/9 |
ISO speed rating | 80 |
Date and time of data generation | 13:24, 25 February 2017 |
Lens focal length | 7.23 mm |
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 | 13:44, 7 March 2017 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 13:24, 25 February 2017 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 5.90625 |
APEX aperture | 6.34375 |
APEX exposure bias | −1 |
Maximum land aperture | 3.34375 APEX (f/3.19) |
Metering mode | Pattern |
Flash | Flash fired, compulsory flash firing, red-eye reduction mode |
Supported Flashpix version | 1 |
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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 | 08:44, 7 March 2017 |
Unique ID of original document | 75A2FA8DFF0004F6E30EA814256C21A0 |