A simple question to ask yourselves:
When you metal detect and get a signal, do you dig until you find what that signal was? Then you are in no way any kind of Archaeologist (amateur or otherwise).
Archies are just like other human beings. Prone to have large egos, inflated senses of self importance, and greedy too. A story that matches perfectly with your cannon story is regarding a place on the North Rim of the Grand Canyon, in a place called Tuckup Canyon. The site was known to local cowboys back into at least the early 1900s. In the 1980s, a Hurricane, Utah Cowboy and Packer named Gordon Smith also saw this native panel. It was amazing and unlike anything he had ever seen before. He decided to take pictures and send them to the National Park Service. In a letter from the head of the NPS, he was called a liar and told that no such native panel exists in America. He claimed the pictures Smith took were from Australia or New Zealand. Eventually, enough people took interest in Smith's Pictures that he was asked to pack in a rock art specialist and archaeologist. When he brought them to this site, they were speechless.
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Long story short, the rock art specialist and the archaeologist took all the credit for the find, and the National Park Service refuses to this day to acknowledge Smith's role in bringing this panel to the public. I call it by its original name "Gordon's Panel". The NPS calls it the "Shaman's Panel"
Mike