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Pages 3-3

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From page 3...
... Preservation of key materials is also of special value, as in the use of coal balls to study the fabric and composition of Pennsylvanian peat, or the use of deep-sea deposits to obtain nearly continuous records of oceanic life and environments. Stable isotopes and other geochemical signatures have been used in a variety of ways to investigate the dynamics of the oceans and climates.


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