It has been proposed that fragments of an asteroid or comet impacted Earth, deposited silica-and iron-rich microspherules and other proxies across several continents, and triggered the Younger Dryas cooling episode 12,900 years ago. Although many independent groups have confirmed the impact evidence, the hypothesis remains controversial because some groups have failed to do so. We examined sediment sequences from 18 dated Younger Dryas boundary (YDB) sites across three continents (North America, Europe, and Asia), spanning 12,000 km around nearly one-third of the planet.
Technology Partners: MimirTech
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/very-high-temperature-impact-melt-products-evidence-cosmic-airbursts-and-impacts
[2] http://admin.indiaenvironmentportal.org.in/category/author/ted-e-bunch
[3] http://admin.indiaenvironmentportal.org.in/category/author/robert-e-hermes
[4] http://admin.indiaenvironmentportal.org.in/category/author/andrew-mt-moore-et-al
[5] http://admin.indiaenvironmentportal.org.in/category/journal/proceedings-national-academy-sciences
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/global-warming
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-change
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-science
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/n-c-america
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/europe
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/asia
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/united-states-america-us
