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Of these are items that depend on the temperature (colder in the winter and warmer in the summer) and solar irradience (less irradience in winter and more in summer).

The basis of this method lies with looking for items that vary with the seasons in a consistent manner.

This depletion is a temperature dependent process so in winter the precipitation is more enriched in H2(16O) than is the case in the summer.

As the water vapor travels towards the poles it becomes increasingly poorer in H2(18O) since the heavier molecules tend to precipitate out first.

A major disadvantage of these types of dating is that they are extremely time consuming.The major disadvantage of this method is that one must have a previously age-dated ice core to start with.In this method one compares certain inclusions in dated ocean cores with related inclusions found in the ice-core of a still undetermined age. Hyde has posted separately some of the relationships between ocean core data and their astronomical causes. 9Be and 35Cl) one can determine the season of the year the precipitation occurred. By comparing the ratios of these isotopes to their nonradioactive counterparts (i.e.

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