Eric Walker added The Bizarre Bird That’s Breaking the Tree of Life | The New Yorker to Genetic genealogy, Cretaceous–Paleogene boundary and Opisthocomus hoazin

Eric Walker added The Chicxulub Asteroid Impact and Mass Extinction at the Cretaceous-Paleogene Boundary | Science to Cretaceous–Paleogene boundary

Eric Walker added Extraterrestrial Cause for the Cretaceous-Tertiary Extinction | Science to Cretaceous–Paleogene boundary

Eric Walker added The Day the Dinosaurs Died | The New Yorker to Cretaceous–Paleogene boundary, Paleontology and Hell Creek Formation

Eric Walker added Cretaceous–Paleogene boundary - Wikipedia to Cretaceous–Paleogene boundary

Eric Walker added Cretaceous–Paleogene boundary and Upper Cretaceous and a number of links to Cretaceous, and added Cretaceous to Geologic time scale (GTS) and Mesozoic

Eric Walker added Cretaceous–Paleogene boundary and Eocene to Paleogene, and added Paleogene to Cenozoic

Eric Walker added a number of links to Cretaceous–Paleogene boundary, and added Cretaceous–Paleogene boundary to Cretaceous and Paleogene