The "dates" are a tad different, but we can't rule out EARLIER Mayan forays into this area.
It's due East of Arrow Rock Missouri, and West of Arcola WV and Arcola VA.
Not that any of that means anything, but if this place has 1/2 square mile of designated space, that's about 500 arpents.
It could very well have a mix of Mayan AND Spanish settlement patterns, and "artifacts".
Don't believe DeSoto's journal when he said they didn't find gold ~ there's ALWAYS gold associated with Iron Pyrite. That's invariably an iron/nickel meteorite site ~ I'll do some detailed checking tomorrow to see if there's an outline of any early settlement that follows the design required in The Law Of The Indies.