Relative age dating has given us the names we use for the major and minor geologic time periods we use to split up the history of Earth and all the other planets. Figure 2: The Geologic Time Scale2-volume set. The Moon's history is divided into pre-Nectarian, Nectarian, Imbrian, Eratosthenian, and Copernican periods from oldest to youngest. Thus the Al Cans layer is about 20 years old. Some minerals in rocks and organic matter e.
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A record of the multiple episodes of reversals of the Earth's magnetic polarity that can be used to help determine the age of rocks half-life:
Relative and absolute ages in the histories of Earth and the Moon: The Geologic Time Scale
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. For example, based on the primate fossil record, scientists know that living primates evolved from fossil primates and that this evolutionary history took tens of millions of years. Chemical substances that cannot be split into a simpler substances fault: Fossils give us this global chronostratigraphic time scale on Earth. The narrower a range of time that an animal lived, the better it is as an index of a specific time.
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