Ha, what a find.

AJ/FormS said

The thing that bugs me, is the mud ain't even dry on it, and already it's 13000 plus years old! Sheesh.

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They can get an approximate relative age on it just by how deep it is in the ground. The only way they can get more specific without actually doing carbon-14 testing is to be able to see the actual variations in the sediment layers in the ground.