The Paleocene Epoch marks the beginning of the Cenozoic Era and spans from 66 to 56 million years ago. It is characterized by a global warming trend, the emergence of modern mammal groups, and the extinction of non-avian dinosaurs. Synonyms for the Paleocene Epoch include the Paleogene Period or simply the Paleogene, which encompasses both the Paleocene and the Eocene epochs. Some scientists also refer to it as the Tertiary Period, although this is no longer an officially recognized term. Regardless of the name used, the Paleocene Epoch remains a crucial period for understanding the evolution of life on Earth.