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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.
In general the plant dates are usually more reliable as they typically represent a more unique event in time.
The plants were relatively short-lived as compared to the time it may have taken for the sediment to form.
The source of this carbon can be from more recent humic and fulvic acids or ancient labile carbon that is alkali-soluble.
Please remove excess water, wrap the samples with plastic (e.g.
Saran Wrap) to limit air contact, place them in a Ziplock bag, and ship to us.
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.