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C Chronostratigraphic Techniques in Paleolimnology.
Now and then I will muse on related Stonehenge topics which have an Ice Age dimension... This is a much more accurate mapping than anything done earlier, and it is what one would expect -- an ice edge running out of steam (if you see what I mean) on undulating terrain, pushing into lowland valleys and held up by hills and ridges.
The technique hinges on carbon-14, a radioactive isotope of the element that, unlike other more stable forms of carbon, decays away at a steady rate.
Organisms capture a certain amount of carbon-14 from the atmosphere when they are alive.
In a stratigraphical context objects closer to the surface are more recent in time relative to items deeper in the ground.
Although relative dating can work well in certain areas, several problems arise.
When it comes to dating archaeological samples, several timescale problems arise.