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Alvarez and colleagues found iridium spikes of about 20 to 160 times background at the Cretaceous-Tertiary boundary in Italy, Denmark and New Zealand and proposed that a large asteroid impact caused the extinctions.
As reported in: Alvarez, Alvarez, Asaro et al. (1980). Extraterrestrial Cause for the Cretaceous-Tertiary Extinction. Science. doi:10.1126/science.208.4448.1095
Lyson and colleagues described fossils from Colorado showing mammal diversity doubled within about 100,000 years after the K-Pg extinction, with larger mammals appearing alongside new plants like the bean family over the next 700,000 years.
As reported in: Lyson, Miller, Bercovici et al. (2019). Exceptional continental record of biotic recovery after the Cretaceous–Paleogene mass extinction. Science. doi:10.1126/science.aay2268