Sedimentary rock age dating

Many of these organisms have left their remains as fossils in sedimentary rocks.

Relative dating does not provide actual numerical dates for the rocks.But, how can we determine how old a rock formation is, if it hasn’t previously been dated?Scientists can use certain types of fossils referred to as index fossils to assist in relative dating via correlation.Radioactive elements decay at a certain constant rate and this is the basis of radiometric dating.But, the decay elements need to be set, much like you would re-set a stop watch for a runner, to ensure an accurate measurement.Index fossils are fossils that are known to only occur within a very specific age range.

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