File:Hammerstone (FindID 818022).jpg
Original file (1,600 × 1,200 pixels, file size: 751 KB, MIME type: image/jpeg)
Captions
Summary
[edit]hammerstone | |||
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Photographer |
Royal Institution of Cornwall, Anna Tyacke, 2017-01-12 17:15:16 |
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Title |
hammerstone |
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Description |
English: A beach pebble with percussion markings in the centre of both faces, perhaps used as a hammerstone. A wide sub-oval in plan, lenticular in profile and an elongated oval in section. The ventral surface shows signs of dense pecking in an approximately circular area around 35mm in diameter. The surface pecking in the centre of the dorsal face is similar in extent but far less dense.
The surface of the stone is uniformly pale creamy-grey in colour with multiple striations of red-brown iron carbonate. Made from a greywacke sandstone beach pebble from the Crackington Formation dating from of the Upper Carboniferous age (332 to 290 million years BP). A very similar hammerstone, from a Bronze Age context at Trethellan Farm, Newquay is illustrated in Cornish Archaeology Vol. 30 (1991) on page 149, fig.62 no.102. |
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Depicted place | (County of findspot) Cornwall | ||
Date | between 2350 BC and 800 BC | ||
Accession number |
FindID: 818022 Old ref: PUBLIC-162BF3 Filename: DSCN4295.JPG |
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Credit line |
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Source |
https://finds.org.uk/database/ajax/download/id/597018 Catalog: https://finds.org.uk/database/images/image/id/597018/recordtype/artefacts archive copy at the Wayback Machine Artefact: https://finds.org.uk/database/artefacts/record/id/818022 |
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Permission (Reusing this file) |
Attribution License |
Object location | 50° 52′ 28.2″ N, 4° 29′ 42.04″ W | View this and other nearby images on: OpenStreetMap | 50.874500; -4.495010 |
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Licensing
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- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
File history
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 06:13, 19 December 2018 | 1,600 × 1,200 (751 KB) | Fæ (talk | contribs) | Portable Antiquities Scheme, CORN, FindID: 818022, bronze age, page 2552, batch count 1750 |
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Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Camera manufacturer | NIKON |
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Camera model | E4500 |
Exposure time | 10/1,611 sec (0.0062073246430788) |
F-number | f/4.4 |
ISO speed rating | 100 |
Date and time of data generation | 17:22, 12 January 2017 |
Lens focal length | 12.6 mm |
Orientation | Normal |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Microsoft Windows Photo Viewer 6.1.7600.16385 |
File change date and time | 17:12, 12 January 2017 |
Y and C positioning | Co-sited |
Exposure Program | Normal program |
Exif version | 2.2 |
Date and time of digitizing | 17:22, 12 January 2017 |
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 |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Manual white balance |
Digital zoom ratio | 0 |
Focal length in 35 mm film | 60 mm |
Scene capture type | Standard |
Scene control | None |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |