Alice C. Linsley
Iron beads were a symbol of royal and priestly authority among Abraham's Proto-Saharan ancestors. One of the shrine cities was Naqada, site of one of the world's oldest known civilizations. The Naqada culture (c. 6000-4000 BC) included the sites of el Badari, Nekhen (Hierakonopolis), Qau, and Gerzeh, where Egyptologist Wainwright discovered meteoritic iron beads, the earliest known artifacts of iron. Stone tools dating to 12,000 years have also been found in the area, revealing a long established human population. This is the region from which Abraham's ancestors came. Today we know more than ever about his Proto-Saharan ancestors.
Naqada settlements dating to about 4,000 BC have yielded decorated pottery, clay figurines and objects made of ivory and iron, as well as alien materials like lapis lazuli, indicating external trade. The civilization advanced due to irrigation, trade, political alliances along kinship lines, and the earliest writing.
The dead were buried in simple oval pits. Later there were more sophisticated burial practices, especially for rulers and their wives.
The Naqada culture appears to have connections to the Nok culture. A figurine of a Nok dignitary portrays a ruler wearing a shepherds crook affixed to the right arm and a hinged flail on the left. Both are symbols of authority among the ancient Nubian (Sudanese/Sudra) and Egyptian rulers. 
"Nok" and "Naqada" might refer to the same family. I say this not only because of the linguistic similarity between "Nok" and "Naq" but also because Set (Seth) was venerated at the temple near Naqada, and according to Genesis 4 and 5, Set is Kano's (Cain) brother.