[Bill Rice]

I can see Spinal Tap trying to use one of these.

[Calvin Locke]

I had the same thought. Toothpicks in one of those home turtle ponds?

Actually, I was listening to a couple of Art Bell recordings from the past few days as background. Egyptians in Illinois. (High-Grade) Copper minings in Michigan supported the bronze age in Troy.

Then again, maybe the pilings are left over from a circular dock. The US went through a period where circular barns were popular.