I did some work on the island of Papau New Guinea. IIRC, they were still finding stone age tribes in the 1960’s in isolated valleys.
Oh absolutely... And in the Amazon. One of the mistakes historians do is judge the technology of one site against all other sites they date to the same era. I really did not realize this factor until they found Gobekli Tepe and dated it at almost 12,000 years ago.
This is when brute ignorant “cave man” was supposed to have crossed the Bering land bridge 20 years ago. We now know it was much earlier and it may have been by sea even though we are still sure cave man was “ hydrophobic”. So what we think we “know” now may not be what we “think we know”.
We are too quick to lock this in as fact when we have so much more to open our perspectives to possibilities. The timeline comparison of technology is a HUGE one. Just look at the difference right now between Mexico, or many African cultures to our own level of technology.
I read “the Grand Valley Dani” in college.
Were you with those folks?