At https://phys.org/print450422309.html … an archaeological site near Seville in Spain was occupied between 3200 and 2300BC – two dates of significance as they coincide with two major narrow growth tree ring events. Where the people arrived from in the first place is unknown – but so too is their fate as the site was abandoned between 2400 and 2300BC (the narrow growth event is dated by Baillie at 2345BC). This was a megalithic culture site – with a funerary function. There was little activity at the site in the 27th century BC (a situation reminiscent of Neolithic sties in the UK) – but this was followed by a new kind of megalithic monument (the tholos of La Pastora) aligned towards the SE (and therefore not on sun rise). The site was abandoned abruptly. The explanation provided by the archaeologists is that a social crisis of some kind occurred (which is code for virtually anything, including a catastrophic event). It is signifricant that upheavals occurred around 2300BC right through the Mediterranean basin (and beyond).