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Paleontologist may identified the types of fossil by determining their age and what era could they possibly emerged, for another method is through the use of radioactive isotopes such as carbon-14. paleontologist used by checking their radioactive carbon fossils.   Radiometric dating is a method used to determine the age of rocks using the decay of radioactive isotopes present in rocks. if they accomplished to determine the age of  fossil then they can proceed what type of fossil.