I have to be quick and dirty to get this up. But here are some links to a flurry of new publications, all of them letters, in PNAS this week concerning the YDB hypothesis:
1.) Age models and the Younger Dryas Impact Hypothesis, Maarten Blaauw, Vance T. Holliday, Jacquelyn L. Gill, and Kathleen Nicoll
https://cosmictusk.com/wp-content/uploads/Age-models-and-the-Younger-Dryas-Impact-Hypothesis.pdf
2.) Inconsistent impact hypotheses for the Younger Dryas, Mark Boslough
https://cosmictusk.com/wp-content/uploads/Inconsistent-impact-hypotheses-for-the-Younger-Dryas.pdf
3.) Suspect cubic diamond “impact” proxy and a suspect lonsdaleite identifcation, Tyrone L. Daulton
https://cosmictusk.com/wp-content/uploads/Suspect-cubic-diamond-%E2%80%9Cimpact%E2%80%9D-proxy-and-a-suspect-lonsdaleite-identification.pdf
4.) Paleoecological changes at Lake Cuitzeo were not consistent with an extraterrestrial impact, Jacquelyn L. Gill, Jessica L. Blois, Simon Goring, Jennifer R. Marlon, Patrick J. Bartlein, Kathleen Nicoll, Andrew C. Scott, and Cathy Whitlock
https://cosmictusk.com/wp-content/uploads/Paleoecological-changes-at-Lake-Cuitzeo-were-not-consistent-with-an-extraterrestrial-impact.pdf
5.) Inconsistent redefining of the carbon spherule “impact” proxy, Mark Hardiman, Andrew C. Scott, Margaret E. Collinson, and R. Scott Anderson
https://cosmictusk.com/wp-content/uploads/Inconsistent-redefining-of-the-carbon-spherule-%E2%80%9Cimpact%E2%80%9D-proxy.pdf
And the reply:
https://cosmictusk.com/wp-content/uploads/Reply-to-Blaauw-et-al.-Boslough-Daulton-Gill-et-al.-and-Hardiman-et-al.-Younger-Dryas-impact-proxies-in-Lake-Cuitzeo-Mexico.pdf
Boslough ignores the research of William Napier (6), who demonstrated that the Younger Dryas boundary (YDB) hypothesis is consistent with Earth’s collision with the Taurid Complex debris field, which could have produced multiple airbursts capable of continent-wide environmental and biotic degradation )
Napier Paper:
https://cosmictusk.com/wp-content/uploads/Paleolithic-extinctions-and-the-Taurid-complex.pdf