Reported evidence for an impact event from the P–Tr boundary level includes rare grains of shocked quartz in Australia and Antarctica; fullerenes trapping extraterrestrial noble gases; meteorite fragments in Antarctica; and grains rich in iron, nickel and silicon, which may have been created by an impact.
As evidencias dun evento de impacto no límite P-Tr inclúen a presenza de raros grans de cuarzo de impacto en Australia e a Antártida; fullerenos que atraparon gases nobres extraterrestres; fragmentos de meteoritos na Antártida; e grans ricos en ferro, níquel e silicio, que puideron ser creados por un grande impacto.