Hi Tim
The stone knife is 17cm. That's a lot longer than they usually. They're usually very short, as you can see from the references you sent.
It's the biggest one I've actually seen, but then I haven't seen that many.
Both edges are actually serrated - there are notches in the stone, saw-like. Still fairly sharp.
Hi Jason
Crocodile teeth are much bigger than this. I believe these are actually shark's teeth. The more I look at them the more I think this is from Queensland and these are shark's teeth. These haven't been sharpened by anything other than evolution. There are little serration marks that are too fine and symmetrical to have been ground.
So let me amend my description - this is a Shark Tooth Lacerator. While shark tooth weapons are used elsewhere in Oceania, they are very scarce here in Australia. This is a rare item in these parts. And by their nature these teeth are more vicious than kangaroo teeth, even sharpened ones.
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