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After all, the scientists haven’t been around that long, have they?There are a variety of different ways to figure out how old an object is.It may be used to date a wide range of natural and man-made materials.
The method compares the amount of a naturally occurring radioactive isotope and its decay products, in samples. It is the main way to learn the age of rocks and other geological features, including the age of the Earth itself.
C in the atmosphere haven’t been constant throughout history (for instance, Noah’s Flood lowered the total amount of available carbon by burying lots of animals and plants).
So something that lived (and died) when the proportion of C was less than normal would appear to have died more years ago than it actually did (for example, it might give an age of 3,000 years before the present, rather than its true age of 2,000 years).
So if scientists wanted to measure the age of a fossil using this method, they would look for a nearby layer of igneous rock (e.g.
rock that forms from lava from a volcanic eruption)—perhaps in the rock layers above where the fossil was found, or in the layers below.
Most people think that scientists can actually measure the ages of rocks, using a method called “radiometric” or “radioisotope” dating.