An additional requirement for accuracy is that the fossil samples do not have a significant lag time associated with their deposition in a lake.
Most plant fossils found in glacial lake sediment are from terrestrial sources.
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An important preliminary requirement for an accurate calibration is that the varves being studied should be exactly matched to a varve chronology or they should be measured and have there own numbering system.
The exact placement of radiocarbon samples and resulting ages relative to other varves in a varve sequence immediately eliminates one form of uncertainty.
With the knowledge of how an organism originally fractionated carbon (based on C to calibrated (estimated calendar) years (Stuiver and Reimer, 1993; Stuiver et al., 1998; updated to CALIB 6.0 by Stuiver et al., 2005, see CALIB at it is now possible to obtain highly accurate calibrations of varve sequences.
Several circumstances are required for a valid calibration of varve sequences using C ages.
A varve sequence might also have events in it of known calendar age, such as beds from flood events or volcanic ash layers that have historic records associated with them.
However, there are some general guidelines in choosing material for dating that may help remove or diminish some uncertainties regarding the lag time problem.
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