Archean geology is a branch of geology that focuses on the study of the Earth's early history, specifically the Archean Eon, which spanned from approximately 4.0 to 2.5 billion years ago. This period is characterized by the formation of the Earth's oldest rocks, the appearance of the first continents, and the emergence of early life forms. Archean geology seeks to understand the processes that shaped the Earth during this time, including the formation of the early crust, the development of the atmosphere and oceans, and the evolution of life on Earth. Researchers in this field study ancient rock formations, geochemical signatures, and fossil records to reconstruct the conditions and events of the Archean Eon.