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© Mark A. Garlick new evidence of a low-altitude meteoritic touchdown event reaching the Antarctic ice sheet 430,000 years ago. Extra-terrestrial particles (condensation spherules) recovered on the summit of Walnumfjellet (WN) within the Sør Rondane Mountains, Queen Maud Land, East Antarctica, indicate an unusual touchdown event where a jet of melted and vaporised meteoritic material resulting from the atmospheric entry of an asteroid at least 100 m in size reached the surface at high velocity. This type of explosion caused by a single-asteroid impact is described as intermediate, as it is larger than an airburst, but smaller than an impact cratering event.

Chelyabinskaya oblastCity ofUnited kingdomBruxelles capitaleMarka garlickFreie universitF van maldeghemVan ginnekenMatthias van ginnekenRussian academy of sciencesDepartment of earthBelgian geologicalSchool of physical science centre for astronomyPlanetary science instituteNational high magnetic field laboratoryRoyal belgian institute of natural sciences