Unlike the recent history of the earth, the very distant past is not on written record.
So how do geologists know that the earth is approximately 4.5 billion old or more?
Relative age dating also means paying attention to crosscutting relationships.
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(1) The lore of fossils is attributed to its link to dinosaurs.
However, fossils are much older than the age of the dinosaurs.
Dinosaurs were extinct 65 million years ago and they ruled the earth for 100 million years before that.
(2) Remember earth is estimated to be well over 4.5 billion years old.
There have been many speculations about our planet earth and its origins and composition.