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C14 Radiocarbon dating can only be used on organic matter.Lithic items cannot be dated by C14 radiocarbon methods but the same principle can be used using radioactive uranium.Simply assuming that an artefact is older because it was found at a lower depth in the record is only subjective science.There are many instances of deep holes being dug for rubbish pits or to locate well water that protrude into the record of older strata injecting more modern material as they are filled in over time.

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There are relatively few dating laboratories and having an artefact dated can be an expensive exercise especially if the artefact is not of great value itself. When an archaeological site is excavated the sides of the unexcavated baulk reveals layering of subsequent settlements and activity.Stratigraphic excavation is the recording and study of these different strata as they are removed from the area.Crystalline minerals when subjected to intense heat will burn with differing colours of flame.Mostly used to date pottery in archaeology the method is very effective but costly.

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