Scandinavian research has shown that strandline gradients decrease exponentially toward the present day. The relationship of gradient to age can be used to estimate the time of formation of a strandline that has not been directly dated, provided that: (1) the gradient of the strandline has been determined, and (2) both gradient and age estimates for two or more other Strandlines in the series are available. As an example, six Strandlines of previously unknown age in southeast Scotland are dated by means of an expression devised from the age and gradient of three other Strandlines from the same series. Any such relationship, however, is valid only for the local area.

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