EntityQ5454123· pop 6· linked from 150 articlesFirst appearance datumSign in to savedate of the oldest known fossil of a given speciesConnectionspaleontologyEntityfossilEntitydigital object identifierEntityInternational Standard Serial NumberEntityNewfoundlandEntitygeologic time scaleEntityOrdovicianEntitystratigraphyEntitybibcodeEntitygeologistEntitystratumEntityradiometric datingEntityConodontaEntityQ22908627EntityInternational Commission on StratigraphyEntitybiostratigraphyEntityHandle SystemEntityGlobal Boundary Stratotype Section and PointEntityTremadocianEntitydiachronismEntityCategoriesBiostratigraphyHistorical geology