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Thus, we determine the age of the rock by the fossils it contains, and we determine the age of the fossils by the rock in which they are found. To learn more about this circular argument, explore our geologic time scale site.Age of the Earth - Radiometric Dating Radiometric dating is the primary dating scheme employed by scientists to determine the age of the earth.Next came Paranthropus, which existed between about one million and three million years ago.The group is distinguished by its larger teeth, giving a wider diet.Our species was distinguished about 200,000 years ago and managed to survive and thrive despite climate change at the time.While we started in temperate climates, about 60,000 to 80,000 years ago the first humans began straying outside of the continent in which our species was born.“This great migration brought our species to a position of world dominance that it has never relinquished,” reads a 2008 article in Smithsonian Magazine, pointing out that eventually we obviated the competition (most prominently including Neanderthals and Homo erectus).Nevertheless, the geologic timescale was thought to have been redeemed and refined with the advent of radiometric dating.
Civilization as we know it is only about 6,000 years old, and industrialization started in the earnest only in the 1800s.While we’ve accomplished much in that short time, it also shows our responsibility as caretakers for the only planet we live on right now.The effects of humans on Earth cannot be understated. Can we determine the age of the earth, and if so, how?Scientists generally agree that the answer to the riddle of the age of the earth is carefully concealed within the earth's crust.
Some of these fossils have been chosen to be what are called "index fossils".