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Posted by / 20-Oct-2017 04:53

Recent radiocarbon dating

If macrofossils are found, the lab will inform the researchers and they can decide if they want to date the macrofossils or sediment.

In some cases, it is wise to date both separately to see if the macrofossils or sediment is yielding the best (most reliable) date.

– If the macrofossils are chosen for the analysis, the reported results will be as “plant material”.

If the sediment is chosen for the analysis, the reported results will be as “bulk organic carbon” or “total acid insoluble organics” depending on the sediment fractions included in the analysis.

You are welcome to contact us to discuss the pretreatment or request that we contact you after the pretreatment to discuss options for radiocarbon dating. However, knowing the dry weight will better allow you to estimate the amount of material to send.

If you want to dry your samples, heating at 90°C to 100°C for 4-24 hours is recommended.

Note: Our lab does not identify the exact type of macrofossil found in the sediment.

Identification of macrofossils requires highly trained scientists, e.g.

Generally, it is better to date the macrofossils present than the sediment due to the possible contaminants in the latter.

This can be useful information if a large core or sequence of cores are being dated.

Sediments that are treated with alkali to extract humic acids (and then dated on the humic acid or humin fraction) can sometimes yield problematic results depending on the localized soil geochemistry.

Alkali extractions on sediments will remove any unbound carbon that is alkali-soluble.

The source of this carbon can be from more recent humic and fulvic acids or ancient labile carbon that is alkali-soluble.

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Please remove excess water, wrap the samples with plastic (e.g.

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