The correct spelling of the geological era which began 66 million years ago is "Cenozoic" (sɪnəˈzoʊ-ɪk). Some people mistakenly spell it as "Cainozoic," which is incorrect. The first part of the word, "Ceno," derives from the Greek word kainos, meaning "new," and the second part, "-zoic," comes from the Greek zōē, meaning "life." This era is characterized by the diversification and proliferation of mammals, birds, and flowering plants. It is also known as the "Age of Mammals."
Cainozoic is a term used in geology and paleontology to define a major division of geologic time, which encompasses the most recent era in Earth's history. Also known as the Cenozoic Era, it spans approximately the last 66 million years, following the Mesozoic Era and preceding the present-day Quaternary Period.
The Cainozoic Era is characterized by the rise and diversification of mammals, which became the dominant fauna on Earth after the extinction of the dinosaurs. This era is further subdivided into three major periods: the Paleogene, the Neogene, and the Quaternary. Each period is characterized by its own significant geological and biological events.
During the Paleogene period, major developments occurred such as the radiation and diversification of mammals, including primitive primates. The Neogene period saw the evolution and spread of more advanced mammals, the emergence of early hominins, and the formation of modern continents and climate patterns.
The current period, the Quaternary, is marked by the fluctuating climate and periodic glaciations, as well as the emergence and spread of Homo sapiens. The Cainozoic Era is of utmost importance to the study of Earth's geological and biological history, providing valuable insights into the evolution of life and the dramatic changes our planet has undergone over millions of years.
In geol., applied to the upper stratified systems holding recent forms of life.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
The word "Cainozoic" (also spelled Cenozoic) is derived from two ancient Greek roots: "kainos" meaning "new" or "recent", and "zoe" meaning "life". Therefore, the term "Cainozoic" can be translated to mean "recent life" or "new life". This term was coined by Sir Charles Lyell, a British geologist, in his book "Principles of Geology" in 1833. It was used to describe the geological era that followed the "Mesozoic" era, which means "middle life". The Cainozoic era is characterized by the emergence and diversification of mammals, including the ascent of humans.