It worth actually to follow links to Abu Hureyra paper [1] to learn that this event is considered not as a solitary impact, but just one in a series of events a

It worth actually to follow links to Abu Hureyra paper [1] to learn that this event is considered not as a solitary impact, but just one in a series of events across four continents. Abu Hureyra's paper also reference paper [2] with a telling name "Evidence for deposition of 10 million tonnes of impact spherules across four continents 12,800 y ago". Here's a fragment of conclusion from that paper: "The geographical extent of the (Younger Drias) YD impact is limited by the range of sites available for study to date and is presumably much larger, because we have found consistent, supporting evidence over an increasingly wide area. The nature of the impactor remains unclear, although we suggest that the most likely hypothesis is that of multiple airbursts/impacts by a large comet or asteroid that fragmented in solar orbit, as is common for nearly all comets. The YD impact at 12.8 ka is coincidental with major environmental events, including abrupt cooling at the YD onset, major extinction of some end-Pleistocene megafauna, disappearance of Clovis cultural traditions, widespread biomass burning, and often, the deposition of dark, carbon-rich sediments (black mat). It is reasonable to hypothesize a relationship between these events and the YDB impact, although much work remains to understand the causal mechanisms." [1] https://www.nature.com/articles/s41598-020-60867-w https://www.nature.com/articles/s41598-020-60867-w [2] https://www.pnas.org/content/110/23/E2088 https://www.pnas.org/content/110/23/E2088