that was a very worthwhile walk in the woods man! If a creek is full of shale or limestone Id head for the higher ground to dig, but I havent been diggin that long, I kinda got in to that while back. I can find the ice age "gravel line" in all my creeks that surround my acreage, these creeks are very deep, shallow, bout 2-4' wide and loaded with good rocks, sometimes REALLY good rocks, I been diggin the gravel line up, only found 2 brokes and a heavyduty drill.