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Posted by / 18-May-2018 11:01

The MRE may also vary over time which adds some uncertainty to the calibrated age range.

This is less of a problem in 'softwater' regions, but glacial meltwater may have added old carbon to some lakes.We pre-screen bones for nitrogen content which allows us to predict whether a bone has sufficient collagen preservation about 85% of the time based on research by Oxford Radiocarbon Accelerator Unit.Bones with low nitrogen content will not be processed to collagen.Identifiable terrestrial plant remains (macrofossils) are therefore usually the preferred samples for radiocarbon dating lake sediments.There is the possibility of re-worked macrofossils being deposited in the lake.

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These include preservatives used in conversation such as wax, varnish, glue, or insecticides and hydrocarbons.