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today I'm with Professor John Ollie
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um John is running the Optical Dating Laboratory
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at Griffith University
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and John and I have both worked on the dating
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of the famous Mongol fossil and um
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today we talk about
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what happens if the results don't agree
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thanks for honor
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it's really good to be here with you
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and discussing the Mongol uh
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dating burial
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so the Mongol site
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as you're aware
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is the oldest ritual burial site
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as yet found on the planet
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uh the body was rubbed with open
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before being turned of its hands
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placed across uh
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the the midsection of the body um
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clear clearly evidence
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that there was burial practices underway at that time
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uh most Australians aren't aware of the importance
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globally of the
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of the Mungo site
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so we applied three different methods um
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within the same university
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but with different abortions of course
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um so we did optical dating um we did um
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uranium serious dating in difference
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but if you look at um
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all the results that we have
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every single one of them
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none of them is 40,000 um
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and it's quite
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difficult to push everything down to 40,000 it's it's
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it's very difficult to explain
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we applied uh
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luminescence dating
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optically stimulated luminescence to the side
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we dated two long profiles through the side
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and we used three uh
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laboratories independently to actually date uh
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the settlement samples one UH1 uh
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laboratory dated one of the channels that was cut
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the other laboratory dated the other chapel was cut
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and I did cross date dating um
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of selected samples to uh
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test the results from each other laboratory
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and when we put all those dates together
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they were incredibly consistent
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more consistent than you'll actually uh
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expect and the dates agreed
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so we ended up with the same ages of the profile
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so I think we applied one technique
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but three laboratories applied that technique
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and we ended up with a very consistent result
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so from that
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I'm pretty confident that we did the best
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optically stimulated luminescence dating
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of the site that we could do
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in addition
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uh I dated uh
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material that was collected from the grave infill by
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Jim and I produced the same age for the grave infill
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as we got from the stratographic layer
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from the three laboratories previously
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and so all the obstacle uh
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ages were consistent and so you
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I can't see anything that we could have done more
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to improve what we did
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we can't both be right um
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because the
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the discrepancy between the dates is
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is more than 2 3
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4 5 Sigma so the
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the error range does not
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does not allow on overlap
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I still I still lean towards the fact that you know
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because we dated the entire stratographic profile
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we did there was no I
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I'm not aware of uh
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any errors in the approach that we took
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three laboratories to be always eldating
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the only weak weakness
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I can see in what we did
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is the fact that we used one dating technique um
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having said all that
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I've looked very
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very closely at what you did
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and the uranium series dating
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and I can't see anything wrong with what you did either
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so the annoying thing for me
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and I'm sure for you
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is that it's nice in science
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if you understand the reasons why there's a difference
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and when you don't understand the reasons
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why there is a difference
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it leads you
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leads you worried that okay
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well if I don't understand
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why that result is different to mine
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have I made a mistake
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is there something in my
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the way the techniques that I've used
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that is actually flawed
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but we don't know about it yet
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in this particular case
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whether we can resolve that
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this is more than questionable
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because the
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as you know
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the Mongol remains have been repatriated
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and without further analysis to
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to cross checks
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perhaps we do cross sections
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Lithuanian series dating across the bone and
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and these sort of things that we developed
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in the meantime
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uh perhaps we could get some insight on on that
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whether it would resolve it
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I don't know
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but I would love to resolve the problems
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but it would be associated with
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more analysis on this glitter material
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and I think that is not something um
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that we should do
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because Mongol has been repatriated and
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and I agree with the
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aboriginal Ada
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Mongol man has done its job for signs
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it should have peace in the land where it came from
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I agree
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