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[/img]RayMondo wrote:The original post, the rock looks of sedimentary nature, though if silicate, somewhat harder though not ideal for flint knapping tool objects. Those are best from flints and obsidian material, though when scarce, other rocks are used. The object's serrations lie in the harder layer, which show signs of knapping, so I reckon it's a human artefact, especially as the serrations are on one side, therefore, used as a cutting, slicing tool.
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