Scholars have several ideas on how the mounds were made
Builders would have started by laying out key points, then digging trenches to fill in the shape. Watch the video below to get a more visual description. In the video below you will learn that the soil that was used to build this Earthwork did come from local area, which was unusual. It could be because the role of this soil was to create a moat that was used to hold water.
The cutaway of the earthwork, at the very beginning shows 4 different colors of dirt (the different shades of brown are subtle) and the dirt was layered horizontally. The number FOUR is significant due to the fact that there are 4 cardinal directions—north, south, east, and west, 4 elements –fire, air, water, and earth, four seasons and 4 segments to a medicine wheel.
