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These elephant tusks certainly look like they contain figuration right down to the centre:

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The area below the shreger lines is referred to as The Lines of Owen, so I suppose that...

From what I have read, there are inner clusters of shreger lines, too, though less pronounced than those at the outer edges and at a different angle. I suppose the pattern you get really depends on...

Some more (vintage) ivory scaled razors to show a bit of variation in the markings:

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Some have hardly any striations at all. In one, the lighter...