|Image Name||Width x Height||Size|
|SIA4151.jpg||1400 x 1094||329K|
|SIA4151.jpg||4812 x 3760||2M|
This is a digitally modified image from "Ancient Monuments of the Mississippi Valley" in the "Smithsonian Contributions to Knowledge", Volume 1. In order to better show the features it has been colorized and a distance marker has been added.