You can use relative dating which is looking at the rocks around it, or you can use radiometric dating, which compares the amount of radioactive element with the amount of nonradioactive element in the rock. Sedimentary rock can't be dated using radioactive dating because it is composed of sediment, which is actually small pieces of different rocks.To date it, you have to use radioactive dating on the surrounding rocks.carbon dating) to as long as billions of years (e.g. Radiocarbon dating of organic samples is a biological application of radioactive isotopes.
One million years, in astronomical terms is a short period of time.
Models of star development dates our solar system at around 5 billion years; this ties in with radioactive dating of meteorites and moon rock samples which dates them at 4.5 billion years.
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So if something is dated about a thousand years ago plus or minus…
Radioactive dating is used to find the absolute age of the rock in which the fossils are found, thus providing a fairly accurate age of the fossil.
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The type of evidence found can be compared to the geologic time scale, a range of eras or periods in which the fossil can be found.