Its never entirely acurate though because fossils form in sedimentry rock whereas the elements required for radiodating exist in igneous rock so they only have a pair of metaphorical brackets to work with when it comes to this type of dating
so for example
(Igneous rock 100years old)
(sedimentry rock with fossil - no date)
(igneous rock 180 years olf)
There there is an 80 year period where the fossil could have formed.Obviously in reality the time periods would be greater and much older than there there cold be 10's of thousands of years between which the fossil could have been formed