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DETERMINING RELATIVE AGE FROM THE ROCK RECORD The convention in geology is to number the layers (beds) within a sequence such that the oldest .. layer at 'B' are pinned down to a common, narrowly defined interval of time.

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18 May 2011 Image: Oldest at the bottom. Relative dating is used to arrange geological events, and the rocks they leave behind, in a sequence. The method of reading the order is called stratigraphy (layers of rock are called strata).

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Relative Dating of Geologic Materials - Grand Valley State University

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