This brings up an interesting pose, as it were.
Last August, I found a 2000 SAC in a local park, in what I would call Fine condition. It was down just about 4 inches. The park soil around these parts, is very granular, and the flora mostly goat weed and/or Russian bent grass. A simple cleaning with soap and water was all it needed. Obviously, I have no idea how long it laid there. The one pictured here is plain ugly, and looks like your average clad after a couple of years.
The pose here is, I wonder how long it takes the various coins (clad or otherwise) to deteriorate under identical soil conditions?
A related pose; I've found late 80s clad pennies is good condition, yet a few feet away will be another with an almost unreadable late 2000 date. Both basically at the same depth. In this case, I wouldn't think the soil conditions would be so different. Or perhaps, there is a difference in the materials used, which doesn't seem plausible.
Like I said, it is just something to muse about when it's raining too hard to hunt!
Alan Applegate