Peter Marsh is a keen diffusionist with a particular interest in the peoples of the Pacific(a). However, this has not precluded him from looking at the Atlantic, where he concluded that the Azores were most likely remnants of Atlantis based on Plato’s description(b) .
He takes Plato’s Atlantis account at face value and accepts that it flourished around 9,500 BC. Additionally, in chapter 10 of his website, he refers to the Michigan copper mines and surmises that they were transported to Europe by Phoenicians and Berbers!
Atlantis in Wisconsin: New Revelations About the Lost Sunken City,  is one of Frank Joseph‘s earliest books in which he conjured up highly speculative links between Atlantis and the geology, archaeology and mythology of Wisconsin. He returned to the Atlantis Wisconsin theme a few years later with the publication of The Lost Pyramids of Rock Lake. Joseph promotes the idea that the copper mines of Michigan were used to fuel the European Bronze Age, an idea promoted by others, including most recently by Gavin Menzies, who suggests that the Minoans exploited the Michigan mines. Menzies had already written about the Chinese ‘discovering’ America decades before Columbus, but seems reluctant to attribute to the Chinese of an earlier age the ability to also have reached America, but is content to accept that the Minoans did!