[jcranmer]

> The invasion of the Sea Peoples from the direction of the Atlantic, and the establishment of cities by the remnants of these times.

The Sea Peoples (at least, those involved in the ravaging of the Hittites and the Egyptians) appear to have come from the vicinity of the Aegean Sea, although the Mycenaean collapse would suggest that they do not originate there. (At the same time, there's no actual written documentary evidence of Mycenaean collapse; that it was caused by the invasion of the Sea Peoples is informed by archaeological evidence of a discontinuity in material culture that happens at about the same time the Egyptians and Hittites are reeling from the Sea Peoples. It's actually consistent with the evidence that displaced Mycenaean peoples are the Sea Peoples as recorded in Egyptian stelae. There is 0 evidence that the Sea Peoples came from the Atlantic or anywhere other than the Eastern Mediterranean.

It's also worth remembering that the Younger Dryas occurred c. 10,000 BC, while the invasion of the Sea Peoples happens c. 1,200 BC. That is, the Sea Peoples happened closer in time to the present than it did to the Younger Dryas.