So much homework....tonight will be an all nighter...ugh. But part of what I am working on tonight is combing a massive database on the Hopewell Indian culture for information on aged remains. They were moundbuilders in the center of Ohio and their influence spread out from WV to the Dakotas. Pretty neat stuff, I grew up across the river from the mounds in Marietta, Ohio. Although, my professor says this particular mound wasn't Hopewellian, but an earlier group.
Interesting that burial mounds were so prolific throughout the Mid-west and South. Even more so because it was practices by several different cultures. Early anthropological theory would say this is probably because of diffusion, one group came up with it and others thought it was a neat idea. I am not a big diffusionist though, at least not without actual proof. I figure the mounds are a product of independent invention. Some cultures (Hopewell, Mississippians, etc) came up with the idea and, because their cultures were so extensive and far-reaching, mounds popped up around the better part of the Mid-west and South.

Conus Mound in Marietta, Ohio.
Built by the Adena Indians, later a revolutionary war and early settler cemetery was built around it.
Image grabbed from James Jacobs archaeoblog: http://www.jqjacobs.net/blog/marietta.html