Relative dating of fossils is based on what
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There are many methods employed by these scientists, interested in the old, to get to know the age of items.It is possible to tell the number of years ago a particular rock or archeological site had been formed.This clock representation shows some of the major units of geological time and definitive events of Earth history.The Hadean eon represents the time before fossil record of life on Earth; its upper boundary is now regarded as 4.0 Ga (billion years ago).
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Researchers reported their findings on 11 May in Current Biology (O. They include the appearance of the earliest baleen whale ancestors.“It’s a nice example for evolution at work.”Before now, the oldest known baleen-whale fossil was 34 million years old.But molecular and physical analyses indicated that whales were older than that.The primary defined divisions of time are eons, in sequence the Hadean, the Archean, the Proterozoic and the Phanerozoic.
The first three of these can be referred to collectively as the Precambrian supereon.The development of radiometric dating techniques in the early 20th century allowed geologists to determine the numerical or "absolute" age of the various strata and thereby the included fossils.
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