By harminka on 2008-01-05 
Craw et al. use the genetic makeup of freshwater fish to determine the age of river changes in the landscape.
Where fish populations have become isolated from each other by glaciation or mountain-building, the fish DNA in the different populations changes in slightly different directions. The age of the isolation event can be determined from the amount of variation in DNA between the two isolated populations. Craw et al.’s study uses some geological events of known age in New Zealand to quantify the rate of change of fish DNA.-Geological Society of America
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