Index fossils dating

This rules out carbon dating for most aquatic organisms, because they often obtain at least some of their carbon from dissolved carbonate rock.The age of the carbon in the rock is different from that of the carbon in the air and makes carbon dating data for those organisms inaccurate under the assumptions normally used for carbon dating.Any type of organism can be distinctive, but not so many are widespread.Many important index fossils are of organisms that start out life as floating eggs and infant stages, which allowed them to populate the world using ocean currents.

In other words, that creature had a defined ‘evolutionary life-span’.That rock layer is x millions of years old because of the fossils in it.

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