The Earth/fertility Mississippian cult was associated with earthen platform mounds. [1]
The act of rebuilding the mounds, of adding additional layers of earth over burials, served as a symbol of renewal, which renewed the earthwork as much as human life. The earthen platform served as the earth, a symbolism which endured into historic times. There are historically documented connections between additions to platforms mounds and the communal " Green Corn Ceremony", which celebrated the new harvest and the fertility of the earth. The quadrilateral, flat-topped design of many platform mounds may represent the Southeastern American Indian belief that the earth was a flat surface oriented towards four quarters of the world. [1]