Sphinx carbon dating who is cliff richard dating
If radiometrically dating the rock layer the artifact was found in, a cache of bones found in the same layer, and perhaps a few other objects/samples all provide similar date ranges, we can be reasonably confident in the dating of the object(s).As for your question about cave paintings and such, the ones capable of being dated usually involve some sort of organic material in the pigments used, from flower petals, berries, that sort of thing.
Depending on the strength of the AMS, its upkeep, the quality of the standards (samples with known ratios), and the purity of tr sample blanks (samples with no 10-Be, only 9-Be), it is possible to obtain ages as young as 100-200 years worth of exposure.
So with that in mind, if the sones at Stonehenge were quarried from depths of of the Stonehenge stones (maximum cosmic ray exposure) would represent the age of the stones and not the rock.
We have known for a while the production rates of 10-Be and 26-Al and so we are able to calculate the length of time it took for rocks like Stonehenge to acquire their cosmogenc signature, thus giving us the age of the exposure and exhumation rather than the actual age of the rock.
Wouldn't that mean that stone that has been buried would yield a lower concentrations of cosmogenic nuclides? The Sphinx' head and body would yield different results..
I was reading something in /r/askhistorians about how stonehenge was radiometric dated to a few thousand years old.
How is dating like this possible, considering that the stone itself is millions of years old? Stone artifacts aren't dated directly (for exactly the reason you suspected), though their age can often be inferred by dating materials associated with them.
This complex burial history can be described by measuring a second cosmogenic nuclide with a different half-life than that of 10-Be and plotting the ratios on a stability chart. With these isotopes you could ideally measure how many years overall te Sphinx has been exposed, though that would underestimate its archaeological age since it was buried.
Using cosmogenics, however is totally dependent on what minerals you have available to use.
The example of the Sphinx provides a unique example of how this might not be as straight forward because it was reburied after initial exposure.
During reburial, the overlying drifting sands shield the Sphinx from cosmic ray bombardment such that the measured concentration of 10-Be from the top of the Sphinx's head is lower than the potential concentration it could have had . 36-Chlorine and 21-Neon are stable isotopes and reflect only the amount of time of total exposure.
One could date the layers above and below the artifact, giving a date range in which it is likely to have been discarded.Tags: Adult Dating, affair dating, sex dating