>-And Oog the caveman did not rub aluminum salts into his armpits,
>eat alum-leavened bread or alum-soaked pickles, cook tomato
>sauce in aluminum pots, drink from aluminum cans....

Aluminium (I am a european) is very common in most soils, So I think
e got a lot of it. It is a question in what form it comes, not
wether it comes at all, because it does.
Besides Oog did not live in a cave. He lived in a hut.
Caves preserves archeologic material, so that is where the founds are
made, but caves are pretty rare.

- Hans