At https://phys.org/print453971146.html … more evidence that migrations of people coincide with major low growth tree ring events. The Lothagum Pillar Site is near Lake Turkana in Kenya, and was built and used between 3000 and 2300BC. This is the pyramid age. It was constructed and used by new comers who brought with them a pastoral economy (sheep, goats and cattle) into what had always been a region dominated by hunter gatherers. Lothogum pillar site was a communal cemetery. Megaliths, stone circles, and cairns flank the 30m high platform. The thrust of the article is that monumentality is not just the product of settled sedentary societies but was also associated with pastoralism (mobile cultures). Presumably it was some kind of central meeting place.
