I’m surveying a historic site that includes four piles of crushed stone in several-inch chunks. The piles are arranged in a square 10 feet on a side. Two of the piles have twisted, torch-cut pieces of galvanized steel angle, about 4" or 6" sides and maybe 3/8" or 1/2" thick, sticking out. I’m wondering what these piles are about.
How old can galvanized steel (iron?) angles be? That is, how long ago did they start making it?
Maybe these piles are the foundation of what was once a power transmission tower. The tower is between a road that has power lines, and a quarry site where a stone crusher was located in 1913 (but wasn’t in 1878 or 1965). Maybe it was how they got power to the site. Any reason this hypothesis can’t be true?