So, hopefully, you can have one more service from us regarding . One reason why radiometric dating of sedimentary rocks is rarely accurate. 8. Circle the letter of one reason why radiometric dating of sedimentary rocks is rarely accurate. a. Radioactive particles in sedimentary rocks are older than the. Dating Sedimentary Rock - Scientists determine the age of dinosaur bones by dating the The most widely known form of radiometric dating is carbon dating. researchers can accurately determine the age of the sedimentary layers between them. This Is One Of America's Most Mysterious PlacesAtlasobscura. com.