Hey Dan -- you bring up an outstanding point, and it's the OTHER reason I think some folks haven't dug dimes at 10". In some places, they DON'T sink that deep. In many of the sites I hunt, the clay is so dense, there's no WAY a coin is "sinking" to 10" deep. In that ground, I find 100-year old coins 2-3-4" deep. Only in softer, loamy soil (or in areas where fill dirt has been spread atop the native clay) do I usually find them deeper than about 6" here.
Excellent point, Dan.
Steve
Minelab Explorer SE Pro, Fisher Gold Bug Pro (DP)
Garrett ProPointer
Lesche 38D "King of Spades"
Norman, OK