What are these "earth pimples" (acne!) as some researchers have described the circular mounds that appear in all over the Red River Valley?

Discovery of an ancient village at Fish Creek, formerly a channel of the Red River in Cooke County, Texas, explains Cross Timbers people.

The Caddo structures were so numerous that Europeans who came to the Red River labeled southwestern Arkansas "Mound City."

Evidence of the Caddo City of the Dead along Ozan Creek at Washington, Hempstead County, Arkansas has been almost entirely eliminated.