With "Tertiary" being discouraged as a formal time or rock unit by the International Commission on Stratigraphy, the K/T event is now called the Cretaceous–Palaeogene extinction event by many researchers. Gradstein F, Ogg J, Smith A. A geologic time scale 2004.{{cite book}}: CS1 maint: multiple names: authors list (link)
Schulte, P.; et al. (2010). "The Chicxulub asteroid impact and mass extinction at the Cretaceous-Paleogene boundary". Science. 327 (5970): 1214–1218. doi:10.1126/science.1177265. PMID20203042.
Schulte, P.; et al. (2010). "The Chicxulub asteroid impact and mass extinction at the Cretaceous-Paleogene boundary". Science. 327 (5970): 1214–1218. doi:10.1126/science.1177265. PMID20203042.