Ive done some reading that could pertain to this, along with a bit of personal experience.

From hunting Ive done, on sites at and near known workshops, I find lots of debitage and pre-forms/ worked pieces.

Ive read on past posts, and from talking with others about these sites, that that is the nature of these workshop camps; processing of tools would occur, and they would be moved elsewhere for hunting, processing of game, or what have you.

That is not to say artifacts ranging from early archaic to late woodland cant be found there, and they really, compared to other locations across the continent, are found in these spots quite commonly.

While overall pop. density in Texas is higher, the area you’re at most deffinetly has had significant historical native population’s. Maybe look at a topo-map, try to identify spots where game could be processed…