sci 245 study notes

Apr 18th, 2015
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Many strata are not dated from fossils. Relative dates of strata (whether layers are older or younger than others) are determined mainly by which strata are above others. Some strata are dated absolutely via radiometric dating. These methods are sufficient to determine a great deal of stratigraphy. Some fossils are seen to occur only in certain strata. Such fossils can be used as index fossils. When these fossils exist, they can be used to determine the age of the strata, because the fossils show that the strata correspond to strata that have already been dated by other means.The geological

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