The area is grown up with trees. There's a trash dump nearby littered with TVs and old mattresses.

That's the 'trash out' part of this. I understand there are a lot of old glass bottles at the dump and volunteers can keep ones they find, as long as the park people sign off on it.

The canopy of trees has grown up since the 1930s.

Prior to 1850, caskets were like Dracula's; they were widest at the shoulder and narrowed down. When they dug a grave, they dug down to a point and then they dug the hole to match the shape of the coffin. This produced a shoulder of undisturbed soil, the coffin ledge, that the archeologist was probing. I tried it, and it takes quite some skill.

You might recover some hardware, buttons, maybe the back of a skull.

Our consciences are littered like an old attic with the junk of sheer conviction.