meaning of fossils chronology and dating of rock

Absolute dating methods determine how much time has passed since rocks formed by measuring the radioactive decay of isotopes or the effects of radiation on the crystal structure of minerals. The fossils in this figure are the remains of microscopic algae. Comparison of commonly used dating methods. Using the principle of faunal succession, if an unidentified fossil is found in the same rock layer as an index fossil, the two species must have existed during the same period of time Figure 4. For example, ammonites have a distinctive feature known as the suture line, where the internal shell layers that separate the individual chambers septae meet the outer shell wall Figure An example of this is given in Figure 8. Primate Origins and the Plesiadapiforms.

MEANING OF FOSSILS CHRONOLOGY AND DATING OF ROCK / morphy.info

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