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New Younger Dryas Impact Hypothesis paper

For people interested in hypotheses about mass extinctions,
there is a new Younger Dryas Impact hypothesis paper. It is; 
Kennett, J. P., D. J. Kennettb, B. J. Culleton, and many others, 
2015, Bayesian chronological analyses consistent with 
synchronous age of 12,835–12,735 Cal B.P. for Younger 
Dryas boundary on four continents. Proceedings of the 
National Academy of sciences of the United States. 
Early Edition, James P. Kennett, doi: 10.1073/pnas.1507146112 
Some related blog comments about it: 
>From the Journal of Younger Dryas Impact Hypothesis Studies 
Musings on Quantitative Palaeoecology, by Richard Telford 
Another article of his is “Platinum spikes extra-terrestrial 
impact as initiator of Younger Dryas Posted on 24/07/2013” 
There is an another paper, which found that the environmental 
changes that mark the beginning of the Younger Dryas are 
diachronous in their time of occurrence according to latitude. 
Along latitude 56–54°N, they ocurred as early as c. 12,900–13,100 cal. BP, 
while further north they ocurred at c. 12,600–12,750 cal. BP. 
This paper is: 
Muschitiello, F., and B. Wohlfarth, 2015, Time-transgressive 
environmental shifts across Northern Europe at the onset of 
the Younger Dryas. Quaternary Science Reviews. 109:49–56. 
Paul H.