简介:In1997,IGCPProjectNo.410wasestablishedtoappraiseknownrecordsofOrdovicianbiotas,inordertoevaluateoneofthegreatest-everdiversificationsoflifeonEarth,between489and443millionyearsago.Datacollectionandanalysisofbiodiversitywerecoordinatedthroughsevenregionalteams,andaglobal“clade”team.