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Suppose you find a fossil at one place that cannot be dated using absolute methods. That fossil species may have been dated elsewhere, so you possibly can match them and say that your fossil has a similar age. Some of probably the most useful fossils for courting purposes are very small ones. For instance, microscopic dinoflagellates have been studied and dated in nice detail all over the world. Correlation with them has helped geologists, similar to Professor James Crampton, date many New Zealand rocks, including these containing dinosaurs.