References / paperExtraterrestrial cause for the Cretaceous–Tertiary extinction
Alvarez, L.W.; Alvarez, W.; Asaro, F.; Michel, H.V.
Year1980
Source roleprimary-study
DOI / ID10.1126/science.208.4448.1095
Fitness and scope
taxonomy · range · event-mechanism
Claim ledger
event-mechanism · highBoundary 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-extinction