Definition of "Cenozoic"

Cenozoic

/ˌkeɪnəʊˈzəʊɪk/

adjective
not comparable
1. (geology) Of or pertaining to the Cenozoic era.
proper noun
1. (geology) A geologic era within the Phanerozoic eon comprising the Paleogene, Neogene and Quaternary periods from about 65 million years ago to the present, when the continents moved to their current position and modern plants and animals evolved.
  Quotations
  The whole history of the earth is divided into five eras, with corresponding rock-systems. These are: 1. Archæan or Eozoic1 era, embodied in the Laurentian system; 2. Palæozoic2 era, embodied in the Palæozoic or Primary system; 3. Mesozoic3 era, recorded in the Secondary system; 4. Cenozoic,4 recorded in the Tertiary and Quaternary systems; and, 5. The Psychozoic era, or era of Mind, recorded in the recent system.
  1883, Joseph Le Conte, Elements of Geology: A Text-book for Colleges and for the General Reader, New York: D. Appleton and Company
  The researchers found that the first day of the Cenozoic was peppered with cataclysms. When the asteroid struck, it temporarily carved a hole 60 miles across and 20 miles deep.
  2019 September 10, Katherine Kornei, “A New Timeline of the Day the Dinosaurs Began to Die Out”, in The New York Times‎