The Need to Reconstruct Paleo-Input Values

A second example The 36C1 C1 ratio in local precipitation is dependent on, among other parameters, the distance from the sea. Thus applying the present local 36C1 C1 ratio to calculate the age of groundwater may be wrong if the shoreline was located at a significantly different distance. 

A fourth example The recharge altitude of an unconfined water system is, under suitable conditions, reconstructed from the composition of 

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