Geology expert John Green visits Cook County

Prof. John Green is a retired geology professor from UMD whose specialty is the geology of the Arrowhead region. He was in town to give a presentation at Chik-Wauk Nature Center and Museum, and was good enough to stop by and chat with Dave about all things North Shore rocks. He has written one of the definitive guides to rocks in our area, "Geology on Display: Geology and scenery of Minnesota's North Shore state parks."