They used buckets of dirt.
They were used for storing goods in. So the other attackers couldn't steal there goods.They sometimed put thier leaders in there or even lived there.
they make it out of tons of dirt, stone or rock.
Adena Indians built mounds using the women and girls of the tribe. They carried clay and earth in woven baskets to the site of the mound. The men only supervised. This from the book"Mounds in the...
They used the mounds as graves and for important ceremonies.