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‘Threshing sledges’ made up of wooden boards inset with flints and pieces of obsidian.



These threshing sledges are dragged over the cereal grain (or other crop) to loosen the edible grain from the inedible chaff that surrounds it.



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The stone pieces were removed in order to establish the kind of use wear traces that this activity would produce.



These pieces were then compared with archaeological materials in order to establish whether such sledges were used in prehistory with the implications of the use of agriculture.