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At least theoretically, the freshwater reservoir effect (FRE) has been known for a longer time than the marine reservoir effect.
The most common cause of high apparent ages in freshwater systems is the presence of dissolved ancient carbonates, leading to the so-called hardwater effect.
The freshwater reservoir effect can result in anomalously old radiocarbon ages of samples from lakes and rivers.
This includes the bones of people whose subsistence was based on freshwater fish, and pottery in which fish was cooked.
Reservoir effects should therefore be considered whenever food remains on pottery or the bones of omnivores are radiocarbon dated - irrespective of the site’s distance to the coast.
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Archaeological samples were provided from the Late Mesolithic sites of Kayhude/Alster and Schlamersdorf/Trave.
HCl-pretreatment was therefore not considered necessary. A modified Longin-procedure with ultrafiltration was used ) in two parallel boreholes at a water depth of 390 cm below present sea level (bpsl).
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