Renne, P.R.; Deino, A.L.; Hilgen, F.J.; Kuiper, K.F.; Mark, D.F.; Mitchell, W.S.; Morgan, L.E.; Mundil, R.; Smit, J.
geochronology · range · event-mechanism · methods
High-precision 40Ar/39Ar comparisons estimate a 66.043 ± 0.043 Ma boundary and synchronicity of impact and extinction within the study resolution.
Boundary clay iridium and impact ejecta support an extraterrestrial impact, while high-precision 40Ar/39Ar ages place the K–Pg boundary at 66.043 ± 0.043 Ma and resolve impact and extinction as synchronous within about 32 kyr.
claim:event:k-pg-extinctionAbrupt fossil turnover at the K–Pg boundary is temporally associated with impact ejecta and the Chicxulub event.
claim:event:k-pg-turnover