Paul, a whole lot is going to depend on the type of soil, the climate, and whether the land gets either tilled or flooded regularly. Here in the desert southwest, it really isn't uncommon for us to find old coins either on or very near the surface since the dry soil forms a hard crust that rarely gets broken or penetrated by moisture.
That being said, in any given area the longer in time the coin has been lost, the deeper it should be relative to newly lost coins unless your in an area that gets plowed or graded regularly. Then all bets are off.
BA
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