Hi I hope I am posting in the right spot. This might be a silly ??..but can a metal detector signal if you are over certain stone or rocks. My son has arrow heads and some other sort of indian rock that was in a magazine and he wants to look for more. We found the one that was in the national geographic for kids in TN by a big stream. He also would like to locate sharks teeth we go to florida every sumer and he would love to have a megalagon sharks tooth. Any advice on this would be greatly appreciated. Thanks
Angie
Angie