Is it mere coincidence, or did Langton see hidden pictures of Christ in the scriptures and divided the chapters at the high point of each picture?
Gen 1 ends with The man and his bride (Christ and the church)
Gen 2 THe man and his bride naked and unashamed
Gen 3 Christ is the "way" and the Tree of life the cross.
Gen 4 Seth has an "only begotten son" named Enos (man) and people once again called on the name of the Lord. Certainly a high point of the chapter.
Gen 5 Lamech means powerful Noah means rest and he has three sons. After Christ comes in power there is the rest of God (Trinity). Shem (nmae) represent the Father whose name is Holy. Ham (hot) whose zeal for his house consumed him. And Japheth (Opon) who gives the increase of the church as the gates of heaven were opened and the dove descended upon Christ and the church.
Gen 6 Noah/Christ did all the Father told him.
Gen 7 Noah/Christ in the flood/grave
Gen 8 The promise of the rainbow, also a symbol of the cross.
Gen 9 Noah's ages at death hold a picture of God's church with Christ
Gen 10 Genealogies showing the fruitfulness of Christ and the church from the end of Chap 9.
Gen 11 Babel is a picture of the cross ending with Christ's fruitfulness hidden in the genealogies.
Gen 12 Contains a cross scene where Abram is afraid to die. Ends with the earth rejecting Christ and the church after the resurrection. This is a rapture scene.
Coincidence or by design ? The Archbishop was an accomplished theologian and commentator on the Bible. It is more likely that he had theological motives than mere page sizes for the divisions.
If he had full awareness of the sodim, Genesis 1 would have been extended into 2.5.
This will make an interesting study someday.