Sclerochronology is the study of physical and chemical variations in the accretionary hard tissues of invertebrates and coralline red algae, and the temporal context in which they formed. It is particularly useful in the study of marine paleoclimatology. The term was coined in 1974 [1] following pioneering work on nuclear test atolls by Knutson and Buddemeier[2] and comes from the three Greek words skleros (hard), chronos (time) and logos (science), which together refer to the use of the hard parts of living organisms to order events in time.