The Cenozoic era is a geological era that began about 66 million years ago and continues to the present day. It is sometimes referred to as the "Age of Mammals" because of the diversification and dominance of mammal species during this time. The Cenozoic era is divided into three major periods: the Paleogene, the Neogene, and the Quaternary. Research in the Cenozoic era focuses on the evolution of mammals, plants, and other organisms, as well as major geological events such as the formation of mountain ranges and the shifting of continents. Scientists study fossils, sedimentary rocks, and other geological evidence to understand the Earth's history during this era and how it has shaped the world we live in today. This research provides valuable insights into climate change, biodiversity, and the impact of human activities on the environment.