The Arabs know that their earliest ancestor was Joktan, also known as Yoktan, progenitor of the ancient Yamani people of Yemen, that tribe which beginning circa 2100 b.c. traded incense to Kush, Canaan, and Assyria. Some of that trade was engaged across the now great desert of Arabia called the Empty Quarter, the Rub Al Khali desert, which circa 2000 b.c. was a land of shallow lakes and pastures, forests and streams (now called wadis), the long trip to the north no problem during the Ice Age.
Across that whole region have been found “neolithic” artefacts of obsidian weapons and ornaments crafted from ocean shells which certainly prove the overland travel across what now is the driest place on earth. And because Joktan along with his sons such as Havilah and Hazarmaveth (namesake of the Hadramaut region of Yemen) were the first people to have settled southern Arabia, we see the proof that was during the Ice Age, in the centuries after Noah’s Flood, the ice age cloudcover for the much greater rainfall having been caused by the greater evaporation off the ocean after the Flood, the ocean having been heated from below.
Of course Seba, namesake of the Sabians of southern Arabia, a son of Kush, was also one of the earliest ancestors of the people who live in Arabia today, all these ancestors from the Table of Nations in Genesis 10 in the Bible, clearly demonstrating that the early portions, like the later books of the Bible, can surely be fully trusted. The Arabs’ usually most cherished ancestor, Joktan, of the line of Shem, was a son of Heber, the Hebrews having descended from Heber’s other son Peleg, so the people of the world quite obviously all descended from the eight on Noah’s Ark, see more here http://genesisveracityfoundation.com.