relative dating rock layers are fossils relative dating

Some fossils, called index fossils, are particularly useful in correlating rocks. The Phanerozoic strata in most of the Grand Canyon are horizontal. The timing of many evolutionary and geologic events on Earth has been determined through two complementary lines of evidence: relative dating and absolute numerical or radiometric dating. Disconformities are unconformities that occur between parallel layers of strata indicating either a period of no deposition or erosion. This rock layer would be younger as indicated by the appearance of new fossils in the rock stratum. Next time you find a cliff or road cutting with lots of rock strata, try working out the age order using some simple principles:. Layers of rock are deposited sequentially.

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