File:Neolithic greenstone axe (profile) (FindID 255963).jpg
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Captions
Summary
[edit]Neolithic greenstone axe (profile) | |||
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Photographer |
Royal Institution of Cornwall, Anna Tyacke, 2009-05-21 01:38:47 |
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Title |
Neolithic greenstone axe (profile) |
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Description |
English: Incomplete gabbroic greenstone axe which has been petrologically analysed by Dr. Roger Taylor as part of the Clodgy Moor Project. Straight-sided in plan and lozenge-shaped in profile and oval in section. About half of the axe remains, including the cutting edge, which has a shaped finish and has broken after some grinding, so it is not a roughout. The axe may have originally been twice as long, judging from similar ethnographic parallels, in order to balance it with the haft. The axe may look like an adze because its blade is slightly off-centre and its section not quite elliptical, or symmetrical either side of the mid-line. But this just shows that it was made from a cobble where one side maintains the original smooth surface that is due to the underlying crystalline formation over time, and the other has been pecked and ground, giving it a rougher, newly exposed surface which comes from inside the cobble (Dave Weddle pers comm). The greenstone is typical of that found in the west of Cornwall from known outcrops and contains pale felspars and dark amphibole inclusions (Dr. Roger Taylor pers comm - see notes below).
Similar examples have been excavated from the Neolithic settlement at Carn Brea and are referred to in Mercer (1981) on page 159, Petrological Identification No.CO 253 (adze) and illustrated on page 155, Fig.64, No.S6 (axe). |
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Depicted place | (County of findspot) Cornwall | ||
Date | between 4500 BC and 2300 BC | ||
Accession number |
FindID: 255963 Old ref: CORN-B60742 Filename: May09finds 003.jpg |
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Credit line |
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Source |
https://finds.org.uk/database/ajax/download/id/211369 Catalog: https://finds.org.uk/database/images/image/id/211369/recordtype/artefacts archive copy at the Wayback Machine Artefact: https://finds.org.uk/database/artefacts/record/id/255963 |
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Permission (Reusing this file) |
Attribution-ShareAlike License |
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File history
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 20:43, 22 January 2017 | 1,280 × 960 (399 KB) | Fæ (talk | contribs) | Portable Antiquities Scheme, CORN, FindID: 255963, neolithic, page 186, batch count 3288 |
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Metadata
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Camera manufacturer | NIKON |
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Camera model | E4500 |
Exposure time | 10/539 sec (0.018552875695733) |
F-number | f/3 |
ISO speed rating | 100 |
Date and time of data generation | 13:30, 12 May 2009 |
Lens focal length | 8 mm |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | E4500v1.2 |
File change date and time | 13:30, 12 May 2009 |
Y and C positioning | Co-sited |
Exposure Program | Normal program |
Exif version | 2.2 |
Date and time of digitizing | 13:30, 12 May 2009 |
Meaning of each component |
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Image compression mode | 4 |
APEX exposure bias | 0 |
Maximum land aperture | 2.8 APEX (f/2.64) |
Metering mode | Center weighted average |
Light source | Tungsten (incandescent light) |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Color space | sRGB |
File source | Digital still camera |
Scene type | A directly photographed image |