Varve chronology is the use of varve sequences to establish time lines in sedimentary sequences and for correlation.
The advantage that varves have over other sediments is that they have tremendous precision of a year and in some cases down to the level of seasonal layers within a varve if intra-annual stratigraphy shows a consistent separation of seasonal features.
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Absolute dating is the process of determining an age on a specified chronology in archaeology and geology.
Some scientists prefer the terms chronometric or calendar dating, as use of the word "absolute" implies an unwarranted certainty of accuracy.
In addition, correlations can sometimes be established by matching basin-wide lithologic changes in varve sequences if they represent isochronous events.
Geologists often need to know the age of material that they find.
They use absolute dating methods, sometimes called numerical dating, to give rocks an actual date, or date range, in number of years.
The atoms of some chemical elements have different forms, called isotopes.
These break down over time in a process scientists call radioactive decay.