Thanks. I sorta figured that one out myself. I’d be interested to know if anyone else has ever seen anything similar in the published literature?
Yes, I have.
Dr J M Adovasio in his book The First Americans proposes just such a scenario for Humans at Meadowcroft 16,000 years ago. His critics said with that early date the glaciers would have been to close for humans to have survived there.
Professor Stephan Oppenheimer's DNA study places Modern Humans At Meadowcroft 25,000 years ago.