1,000-1,600 A.D. In this period agriculture really started growing. For example, people started to grow plants in gardens. the Mississippian Indians always LIVED by waterways. THEY WERE NOT NOMADS!! In the villages, a chief would be in charge. This period was also known as the "mound period." The Mississippians built hundreds of mounds across the country. The most recognized ones in Georgia are "Rock Eagle" and "Hawk Rock."