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This includes the bones of people whose subsistence was based on freshwater fish, and pottery in which fish was cooked.
The surprisingly old ages of the earliest pottery most probably are caused by a freshwater reservoir effect.
One of the basic assumptions in radiocarbon dating is that a sample incorporates carbon in equilibrium with the atmosphere. The marine reservoir effect is well-acknowledged among archaeologists, although the knee-jerk subtraction of 400 years from radiocarbon dates of marine samples might be too simplistic in some cases.
At least theoretically, the freshwater reservoir effect (FRE) has been known for a longer time than the marine reservoir effect.
About AMS Dating Accelerator Mass Spectrometry (AMS) dating involves accelerating ions to extraordinarily high kinetic energies followed by mass analysis.
Radiocarbon Dating Groundwater The application of radiocarbon dating to groundwater analysis can offer a technique to predict the over-pumping of the aquifer before it becomes contaminated or overexploited.