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    Quaternary dating methods wiki

    In a similar way, the most recent era is expanded in the third timeline, and the most recent period is expanded in the fourth timeline.

    The geology or deep time of Earth's past has been organized into various units according to events which took place.A consequence of this approach to the Phanerozoic periods is that the ages of their beginnings and ends can change from time to time as the absolute age of the chosen rock sequences, which define them, is more precisely determined.The set of rocks (sedimentary, igneous or metamorphic) that formed during a geologic period is known as a system, so for example the 'Jurassic System' of rocks was formed during the 'Jurassic Period' (between 201 and 145 million years ago).The first shows the entire time from the formation of the Earth to the present, but this gives little space for the most recent eon.Therefore, the second timeline shows an expanded view of the most recent eon.

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