It's not just possible, but highly likely. Graham Hancock has compiled an impressive amount of evidence for pre-Younger Dryas civilizations in books like Magicians of the Gods.
Graham Hancock is not an archaeologist, and actual archaeologists disagree with him. That "impressive" evidence sounds like cherry-picked non-sequiturs.
https://www.scientificamerican.com/article/no-there-wasnt-an...
https://www.skeptic.com/reading_room/defant-analysis-of-hanc...