File:Flint-knapped arrowhead (Upper Mercer Flint, Middle Pennsylvanian; Nellie-Warsaw area, Ohio, USA) 1.jpg
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Summary
[edit]DescriptionFlint-knapped arrowhead (Upper Mercer Flint, Middle Pennsylvanian; Nellie-Warsaw area, Ohio, USA) 1.jpg |
English: Flint-knapped arrowhead ("Nellie Blue Flint") from the Pennsylvanian of Ohio, USA. (~6.6 centimeters tall; modern replica)
"Flint" is the official gemstone of Ohio. Flint is actually chert (the two terms are synonymous, despite what anyone else might say), a cryptocrystalline, quartzose sedimentary rock. High-quality, colorful, multicolored, and multipatterned flint is moderately common at some Ohio localities. A couple famous flint occurrences in east-central Ohio include the Vanport Flint at Flint Ridge and Nellie Blue Flint in Coshocton County. Nellie Blue Flint is essentially restricted to the Nellie area of northwestern Coshocton County. It consists of attractive, frequently complexly-patterned, dark bluish to bluish-black chert. Fractures and cavities (vugs) are often present and have been filled or nearly filled with pale bluish-gray chalcedony and/or megaquartz (= visible hexagonal quartz crystals). Body fossils and trace fossils can be present. Nellie Blue is a local color variant of the Upper Mercer Flint, which is usually a black flint with whitish speckles (= often body fossils and fossil fragments). The Upper Mercer Flint is a somewhat persistent horizon of chertified marine fossiliferous limestone in east-central and eastern Ohio called the Upper Mercer Limestone. Flint knappers often call this material "Coshocton Flint". Stratigraphy: Upper Mercer Flint (= chertified Upper Mercer Limestone), upper Bedford Cyclothem, upper Pottsville Group, Atokan Series, lower Middle Pennsylvanian Locality: undisclosed site about halfway between the towns of Warsaw and Nellie, northwestern Coshocton County, east-central Ohio, USA |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/51430942108/ |
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@N05/51430942108. It was reviewed on 7 September 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
7 September 2021
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current | 14:40, 7 September 2021 | 1,803 × 2,825 (3.07 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/51430942108/ with UploadWizard |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/10 |
ISO speed rating | 80 |
Date and time of data generation | 17:54, 4 September 2021 |
Lens focal length | 9.681 mm |
Width | 4,000 px |
Height | 3,000 px |
Bits per component |
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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 18.0 (Macintosh) |
File change date and time | 15:13, 6 September 2021 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 17:54, 4 September 2021 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 5.90625 |
APEX aperture | 6.65625 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 3.625 APEX (f/3.51) |
Metering mode | Pattern |
Flash | Flash fired, compulsory flash firing, red-eye reduction mode |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 16,460.905349794 |
Focal plane Y resolution | 16,483.516483516 |
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 | Standard |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 11:13, 6 September 2021 |
Unique ID of original document | 6BEF220FB29DC55C04EEA60FE92961F1 |