Varve dating definition

18-Aug-2020 14:48

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.As a result, winter layers are thicker here than summer layers.Still, summer layers vary more in thickness than winter layers.The count of varves back from the present then gives an estimate of the absolute age of the sediment provided that the varve sequence does not have any gaps or the lengths of gaps can be estimated precisely.To construct a varve record in glacial lacustrine sediment the thicknesses of annual layers are counted and measured to formulate a time scale of varve years and corresponding varve thickness.Varve record: A measured string of varves from a single exposure or drill core.

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Varve sequences allow us to fix very precisely in varve years the age of any fossil or sediment feature found in the varves or the varve age of any event that may be tied to the varve sequence.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.