Īlthough the mounds were primarily meant as substructure mounds for buildings or activities, sometimes burials did occur there. Some of the terraces and aprons on the mound seem to have been added to stop slumping of the enormous mound. Monks Mound had at least ten separate periods of mound construction over a 200-year period. Some mounds were developed with separate levels (or terraces) and aprons, such as Emerald Mound, which is one large terrace with two smaller mounds on its summit or Monks Mound, which has four separate levels and stands close to 100 feet (30 m) in height. These pits were sometimes left to fill with water and stocked with fish. The large amounts of fill needed for the mounds left large holes in the landscape now known by archaeologists as " borrow pits". This pattern could be repeated many times during the life of a site. These layers also incorporated layers of different kinds of clay, soil and sod, an elaborate engineering technique to forestall slumping of the mounds and to ensure their steep sides did not collapse.
Sometimes the surface of the mounds would get a several inches thick coat of brightly colored clay. At periodic intervals, averaged about twenty years, these structures would be removed, possibly ritually destroyed as part of renewal ceremonies, and a new layer of fill added, along with a new structure on the now higher summit. This site was covered with a layer of basket-transported soil and clay known as mound fill, and a new structure constructed on its summit. The site of a mound was usually a site with special significance, either a pre-existing mortuary site or civic structure. Many of the mounds were the result of multiple episodes of mound construction, with the mound becoming larger with each event. Documented uses for Mississippian platform mounds include semi-public chief's house platforms, public temple platforms, mortuary platforms, charnel house platforms, earth lodge/town house platforms, residence platforms, square ground and rotunda platforms, and dance platforms. When Europeans first arrived in North America, the peoples of the Mississippian culture were still using and building platform mounds. These platform mounds are usually four-sided truncated pyramids, steeply sided, with steps built of wooden logs ascending one side of the earthworks.
Many different archaeological cultures ( Poverty Point culture, Troyville culture, Coles Creek culture, Plaquemine culture and Mississippian culture) of North Americas Eastern Woodlands are specifically well known for using platform mounds as a central aspect of their overarching religious practices and beliefs. The indigenous peoples of North America built substructure mounds for well over a thousand years, starting in the Archaic period and continuing through the Woodland period. Temple Mount at Ocmulgee National Monument
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