Hebrew years 840 to 960 (2920-2800 BCE)
After the discovery made by Tuval-Cain, the technique of metal works was used to create weapons. The technique quickly spread across the known world. Life became more dangerous for human beings as conflicts eventually became more frequent between city-states.
This was a turn for humanity. This was the end of the first millennium from Creation and, symbolically, it was the time when Adam died, in Hebrew year 930 (2830 BCE). According to Tradition, Hanoch buried him in a cave that was later used by the Patriarchs as well (it became known as the Cave of Machpelah). But I believe that Hanoch was in Egypt at the time of Adam's death and that it was his son Seth who buried Adam in this cave of Hebron, because of a similar pattern followed later by the Patriarchs: each of them buried their wife first, before being buried by their son and heir, so the same must have applied to Adam, who buried Eve in the cave first and he must have been buried by his son Seth afterwards.
The few people who walked in the path of God were Seth and those who lived with him.
Metushalach had already escaped away from the civilization of the Nile Valley and had settled in Canaan near Adam and Seth. They nurtured him in righteousness. In year 874, he had a son called Lemech.