I'm in southern cal and am new to metal detecting, just spent about 4 hrs on my new (well new to me) t2se at a local old park. The park dates back to 1929 so should have some old stuff in it. I noticed that I've been finding foil/pulltabs/aluminum bottle caps about 2-5 inches down both on bare ground and what little sod I've cut through. ( I try to avoid damaging sod and stick to bare ground/woodchips till I get better at plugging). I've gotten mountains of pulltabs, some new clad and zero anything old. I'm guessing that there are layers of new topsoil/sod that bury the older layers deeper down. The park is on a hilltop, this is my question. Would it be better to concentrate on the sides of the hill where the park has not laid down new material. Is it better to go bp mode, ignore the top layer signals to concentrate on deeper items at the cost of having to dig deep to get to them ? I'm sure digging deep is quite frowned upon. Is there another way of going about this that I'm missing ? Thanks for any input.