I collected this in 1967, during my PhD program, when I went on an economic geology trip with Dr. Bill Kelly and Dr. Stewart Turneaure to Upper Michigan. This geological find was new to me, as was beautiful white snow on autumn colors in the 3rd week of September. (THIS is why we do geology). It was during this trip that we discovered that you could ask Dr. Turneaure about any part of the train schedules (departures and arrivals) between any two cities of your choice in the eastern United States, and the Midwest. For example, what train will be available on a Sunday afternoon, to take you from Chicago to St. Louis? He would rattle off the name of the 'line' and the times. Scary. The courses Dr. Turneaure taught on ore deposits geology, mining geology, and Precambrian geology were full of detail,…and insight.
Age & Formation
Calumet Conglomerate is the host for the native copper, late Mesoproterozoic, ~ 1.1 Ga.