Isn’t Luzon where, about 40 years ago, a stone age tribe was found living in caves? It made all the news and magazines till it was proven a fake.
The Tasaday?
On the one hand:
The Stone-Age Tasaday
http://hoaxes.org/archive/permalink/the_stone-age_tasaday
But the fact is, the accusations of hoax were generated by loudmouth leftists opposed to the Marcos regime:
https://en.wikipedia.org/wiki/Tasaday
Actually, it was Mindanao.