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My friend & I use a thin, hollow, aluminum tube about 3 feet long & our goal around these suspicious mounds/depressions is to HIT POTTERY. It's more abundant & gives a very distinct hollow "THUD". This won't be effective in most areas, but wooded areas with soil might be worth it. I started with a knowledgeable friend, a google satellite search along local rivers & a cheap metal detector. I tapped a nice adze last fall in my first couple pokes with a probe one day. They are are waste of time in many (stoney) regions, but awsome time savers for others. Nice finds Triumph! Congrats!