ceno

**Ceno**

The Ceno is a hypothetical geological period that has been proposed as a potential successor to the current geological time scale. Unlike the established periods such as the Paleozoic or Mesozoic, the Ceno is not officially recognized by the International Commission on Stratigraphy (ICS). However, it has been suggested as a way to encapsulate the most recent and rapidly evolving geological and biological history of Earth.

The term "Ceno" originates from the Greek words *kainos* (new) and *zoon* (life), reflecting the era's defining characteristic: the rise and diversification of modern mammals, birds, and flowering plants. This period is traditionally divided into the Paleogene, Neogene, and Quaternary epochs, which span from about 66 million years ago to the present. The Quaternary epoch, in particular, is notable for its significant climatic fluctuations, including the development of ice ages and the emergence of human civilization.

Advocates of the Ceno period argue that it provides a more coherent framework for studying the recent geological and biological history, particularly the rapid changes observed in the last few million years. This includes the formation of major landmasses, the evolution of modern ecosystems, and the impact of human activity on Earth's systems. While not formally adopted, the concept remains relevant in discussions about Earth's dynamic and evolving environment.