The term 'Geology Periods' refers to the different ERAS of Earth's history, which are divided into four main categories: Paleozoic, Mesozoic, Cenozoic, and Quaternary. The Paleozoic Era is the oldest, spanning from 541 million years ago to 252 million years ago. During this period, life on Earth began to diversify and the first land plants and animals appeared. The Mesozoic Era followed, lasting from 252 million years ago to 66 million years ago. This era is known as the 'Age of Reptiles' and saw the emergence of dinosaurs. The Cenozoic Era began 66 million years ago and continues to the present day. This era is characterized by the emergence of mammals and the extinction of the dinosaurs. Finally, the Quaternary Period began 2.6 million years ago and is marked by the emergence of humans and the development of agriculture.