[blam]

I've read a little about the mounds you describe. I don't think they are the same as 'raised-beds.' The mounds you describe are much larger and taller.

1100 years ago category 5 hurricanes were much more frequent than today. I often wonder if they were a refuge from the flooding from these 'super hurricanes.'

[muawiyah]

The Seymour mounds are about the same height as the Anderson mounds that have astronomical significance.

15 feet is typical; there are some taller ones about 20 feet high.

Adena and Hopewell structures are far larger, made of earth, and ordinarily have human remains and artifacts buried in them.