I've said a lot here about how northern Gaul steadily grew as a rival power centre against Rome. It had been a centre before the Gauls even showed up: "Population discontinuity in the Paris Basin linked to evidence of the Neolithic decline" by Seersholm et al..
A feature of 4300–3100 BC was the megalith. These quit being built. The study here deals with a grave site toward the last century of this; these were communal tombs. Nobody was being buried 3000, either. The paper implicates the yersinia - and another bug, Borrelia recurrentis. After the crash, the forests grew back.
As to why the focus on this last century, "excess mortality" hit around this time, carrying off the young as well as the old. The paper leaves until later any pathology: starvation? war?... influenza?
Also this earlier "Phase One" tomb was a family tomb, patrilineal (on H2a1). The daughters, if old enough to be married off, were married off perhaps to be found in other tombs. Some of the burials had "homozygosity" - they were from cousin marriages. That cannot have been healthy either.
The forest was reclaiming "Scania" - Geatland - 3100 BC; then Denmark / Holstein 3000-2800.
A new people came 2900 BC, of what the abstract names "Neolithic ancestry". That came from Iberia; that which survives best today in Sardinia. These farmers stuck around for a half century. They say these tended not to build communal tombs; but, here, the paper does look into one tomb, in use until strangely-precise 2470 BC. Regions are regions, we suppose. Anyway, these burials had died older and of more natural causes. Plague was around then too but less of it. They didn't venture much further northeast, leaving Scania fallow.
The Steppe rolled in 2300-1700 BC. These will be the ItaloCelts. The lead author notes elsewhere they also resettled the new-growth Scania.
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