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...a I have in mind come from a sediment core sequence taken from the bottom of a lake. The sequence is sliced into a priori defined slices, in this case 0.2cm per slice. in this way a sequence of 0.2cm slices is produced for the entire core. 2) Each slice is assigned a date (plus some error) using radiometric dating techniques and a derived age/depth model (we age some of the samples and then interpolate/extrapolate for the other samples). This can be done in a variety of ways but effectively the end result is that each 0.2cm sediment slice has a date (year) attached to it (with some error). Chan...