A fascinating read is the book “In Plain Sight: Old World Records in Ancient America” by Gloria Farley. She records and interprets petroglyphs up to about 4,000 years old. Frequently found near rivers that could have been traveled by people coming from the Atlantic and Caribbean seas. Suggests visits by Phoenicians, and other ancient people.
I’ve read some of Farley’s stuff, probably in ESOP years ago, but not sure I’ve got that particular title, Thanks g.