I think all these dates are approximate and variable, so given the purpose of the databases I think we should avoid unnecessary complication. We now know the start of the Neolithic isn't synchronous but spans c 4100-3800 BC; however 4000 is a happy medium that is probably wrong everywhere, but not importantly so!
Could we also get a specialist's view on the Early/Late subdivision of the Mesolithic? This seems rather vague in chronological terms and I think recent scientific dating has pushed back the date of narrow blade microliths closer to 8000 than 7000?
Jonathan
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