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Grime's Graves
Grime's Graves or Grimes Graves is a large Neolithic flint mining complex in Norfolk, England, though Brandon, Suffolk is the nearest town. It was worked between c. 3000 and c. 1900 BC, although production may have continued well into the Bronze and Iron Ages (and later) owing to the low cost of flint compared with metals. Flint was much in demand for making polished stone axes in the Neolithic period. Much later, when flint had been replaced by metal tools, flint nodules were in demand for other uses, such as for building and as strikers for muskets.
The scheduled monument extends over an area of some 37 ha (96 acres) and consists of at least 433 shafts dug into the natural chalk to reach seams of flint. The largest shafts are more than deep and in diameter at the surface. It has been calculated that more than 2,000 tonnes of chalk had to be removed from the larger shafts, taking 20 men around five months, before stone of sufficient quality was reached. An upper 'topstone' and middle 'wallstone' seam of flint was dug through on the way to the deeper third 'floorstone' seam which most interested the miners. The site is managed by English Heritage and can be visited.
==Mining Method==
In order to remove the chalk efficiently, the ancient miners built wooden platforms and ladders as they dug downwards and piled the spoil around the shaft opening using turf revetments to hold it in place for the season, when the shaft and all its galleries were thoroughly and fastidiously backfilled to promote stability. The landscape around Grime's Graves has a characteristic pockmarked appearance caused by the infilled shafts. This is probably what inspired the later Anglo-Saxon inhabitants of the area to name it after their god Grim (literally the masked, or hooded one, a euphemism for Woden). Although the pagan Anglo-Saxons seem to have had some idea of what the site was, as the name of the site means literally 'The masked one's quarries,' (or Grim's Graben,) it wasn't until Canon William Greenwell excavated one of the shafts from 1868- 1870 that their purpose was discovered in modern times. Other similar sites have been found in chalk or downland areas, such as at Cissbury, and Spiennes in Belgium.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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