signs and symbols

Hi, These stripes are about 8" high & there's a small red circle between them. I'm wondering if they could be Aboriginal paintings or markers made by shipwreck survivors. There are no other paintings in the area within several miles that I'm aware of. regards HH

Folks, I figured after reading all the excellent posts and filling my empty head with free treasure hunting knowledge, I should register. I do a lot of construction in the NOVA area and after reading these posts have realized that I have been seeing these signs. I have pictures of a sign tree...

Anybody who can say something regarding this sign on a rock in our area.. PLease help thanks!