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The three main methods used to date sedimentary rocks ...

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Constraints on the use of fossils <strong>to</strong> establish<br />

chronostratigraphic subdivisions<br />

1. Imperfection of the preserved record<br />

<strong>The</strong> full range of any given species is not necessarily<br />

represented in any given stratigraphic section.<br />

Fossils documented at a type section may not be fully representative because of preservational fac<strong>to</strong>rs

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