What is inside a mound?

Mounds were used mostly for burial of the dead. Along with the bodies, either laid in the earth or cremated first, were many artifacts. These artifacts include jewelry, spear points, tools, pottery, clothing and artwork on stone. In addition, pieces of mica and flint have been found. Some mounds have been excavated to uncover nothing at all. Archaeologists are not yet sure what the reason for these structures were.