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The biological history of the Earth has been punctuated by mass extinctions that wiped out a vast majority of living species in a geological instant.

United statesJoseph canyonPaul renneBrenhin kellerEli burakianGrande rondeUniversity of californiaProfessor of earth sciencesProfessor of earth sciences brenhin kellerCretaceous periodEarth sciences brenhin kellerAssistant professorSiberian trapsTheodore greenYucatan peninsulaSenior fellowship