You can browse the archives for this section.
An example of a ridge topped mound - Mound 86, Cahokia.
Fowler, M. L. 1997. The Cahokia Atlas: A Historical Atlas of Cahokia Archaeology. revised edition. University of Illinois, Urbana. Fig. 9.1c, p.187
Image courtesy of the Board of Trustees of the University of Illinois and the Illinois Transportation Archaeological Research Program.