The Mississippian is a geologic (sub)period lasting from roughly 360 million years before the present (BP) to 325 million years BP. As with most other geologic periods, the rock beds that define the period are well identified, but the exact start and end dates are uncertain by a few million years. In North America, where the interval consists primarily of marine limestones, it is treated as a full-fledged geologic period between the Devonian and the Pennsylvanian. In Europe, the Mississippian and Pennsylvanian are one more-or-less continuous sequence of lowland continental deposits and are lumped together as the Carboniferous period.
The Mississippian culture was a Mound-building Native American culture that flourished in the Midwestern, Eastern, and Southeastern United States in the centuries leading up to European contact.
The Mississippian way of life began to develop around 900 A.D. in the Mississippi River Valley (for which it is named).
The Mississippian (archaeological) Stage is usually considered to come to a close with the arrival of European contact, although the Mississippian way of life continued among their descendants.
The MississippianPeriod in the midwestern and southeastern United States, which lasted from about A.D. 800 to 1600, saw the development of some of the most complex societies that ever existed in North America.
It was believed that the Natchez chief, probably like most Mississippian chiefs, could influence the supernatural world and therefore had the ability to ensure that important events like the rising of the sun, spring rains, and the fall harvest came on time.
The MississippianPeriod in Georgia was brought to an end by the increasing European presence in the Southeast.