File:Grindstone (worked edge in profile) (FindID 811170).jpg
Original file (1,600 × 1,200 pixels, file size: 783 KB, MIME type: image/jpeg)
Captions
Summary
[edit]grindstone (worked edge in profile) | |||
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Photographer |
Royal Institution of Cornwall, Anna Tyacke, 2017-01-12 17:36:45 |
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Title |
grindstone (worked edge in profile) |
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Description |
English: A natural, unmodified beach cobble of uncertain date which has been used as a grinding stone or pestle. An elongated oval in plan and in profile, oval in section. Made from a greywacke sandstone beach cobble from the Crackington Formation dating from of the Upper Carboniferous age (332 to 290 million years BP). An oval patch, 46 mm long and 24 mm wide, has been worn near the distal end of the left hand side, when viewing the ventral surface. The surface of this patch is worn through percussion and smoothed by rubbing, apparently when held at an angle in one hand.
The ventral surface of the stone is mottled reddish-brown and pale grey: the dorsal surface is grey-brown with striations of red-brown iron carbonate, with a narrow band of hard, cream-coloured inclusion forming a crusty protrusion from the surface. Pestles with bevelled utilised edges, found at Scarcewater, Cornwall in Bronze Age contexts, are illustrated in Jones and Taylor (2010) on pages 122 & 129, figs.60 & 66, nos.236 & 622. |
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Depicted place | (County of findspot) Cornwall | ||
Date | between 4000 BC and 800 BC | ||
Accession number |
FindID: 811170 Old ref: PUBLIC-FC3D1E Filename: DSCN4294.JPG |
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Credit line |
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Source |
https://finds.org.uk/database/ajax/download/id/597029 Catalog: https://finds.org.uk/database/images/image/id/597029/recordtype/artefacts archive copy at the Wayback Machine Artefact: https://finds.org.uk/database/artefacts/record/id/811170 |
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Permission (Reusing this file) |
Attribution License version 2.0 (verified 14 November 2020) |
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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File history
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 06:09, 19 December 2018 | 1,600 × 1,200 (783 KB) | Fæ (talk | contribs) | Portable Antiquities Scheme, CORN, FindID: 811170, mesolithic, page 2551, batch count 1739 |
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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 | 5/811 sec (0.0061652281134402) |
F-number | f/4.4 |
ISO speed rating | 100 |
Date and time of data generation | 17:21, 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 | 17:21, 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 |