You must have a good eye, to find all of those. Maybe there just aren't very many where I live, though this was Dakota and Ojibwa country. About the only thing I ever found was an eight-inch stone that had been formed into a spearhead, but was very rough and unfinished.

Someone told me that, if you head out to a freshly plowed field, sometimes the digger heads turn up arrow points. Any idea if that's true?

While hiking in Spain, though, there are so may ruins and worked stones. A group of us used to hike through the area frequently and the guide (history buff) showed us cave paintings from the Bronze Age.