the names in each are variants of those in the other, though their order differs, with the names of Enoch and Mahalalel/Mehujael switching places in the two pedigrees. It is "as if they were different versions of the same underlying tradition." This has led to speculation that a single original genealogical descent had diverged during independent transmission, only to be brought back together and put to different uses when the Book of Genesis was compiled from its Jahwist and Priestly sources. Generations of Noah Following the Genesis flood narrative, a large multi-branched genealogy presents the descendants of the sons of Noah. () The 70 names given represent biblical geography, consisting of local ethnonyms and toponyms presented in the form of eponymous ancestors (names in origin-myth genealogies that are to be understood as ancestors and embodiments of the peoples whose names they bear). This is a symbolic presentation of the peopling of the world and indicates a view of the unity of the human race. The peoples and places are not organised by geography, language family or ethnic groups, and probably do not represent the geography of a particular point in history, instead deriving from an old nucleus of geographical knowledge to which additional names/peoples were subsequently added. Abraham's family tree The following is a family tree for the descendants of the line of Noah's son Shem, through Abraham to Jacob and his sons. Dashed lines are marriage connections. Genesis chrono-genealogy The numbers given in the text are usually similar but do vary between versions. The numbers in the Masoretic, Samaritan, and Lucianic Septuagint versions of Genesis are shown in this table: The following table lists the patriarchs that appear in the Vulgate and the Septuagint, but their names are spelled as they appear in the King James Version of the Bible. Their year of birth differs according to the Vulgate or the Septuagint. Also given is each patriarch's age at the birth of his named son and the age of the patriarch's death. Cainan, born after the flood, is mentioned in the Septuagint but not the Vulgate. Methuselah survived the flood according to the Septuagint (but not the Vulgate), even though he was not on Noah's Ark. The genealogies of Genesis contain a difficulty with regards to the birth of Arphaxad. One method of calculating places the birth of Arphaxad 600 years after the birth of Noah, while another places