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To use a varve sequence to establish the true or calendar ages of events it is necessary to calibrate the sequence with numerical ages.
Varve series: A number of varve records that have been matched from a relatively constrained area and together make a longer and more accurate sequence than a single varve record.
Still, summer layers vary more in thickness than winter layers.
The thicknesses of summer and winter layers are recorded as shown with the posted red and blue lines.
In addition, correlations can sometimes be established by matching basin-wide lithologic changes in varve sequences if they represent isochronous events.
Throughout this web site the terms varve record, varve series, and varve chronology are used to denote varve sequences of different hierarchical status.