Upper Peninsula of Michigan. Late Precambrian Lava Flows. This map of the location of the copper-bearing formations of the Lake Superior Basin was sketched by Professor F. S. Turneaure of the Department of Geology of the University of Michigan. We annotated the map of the data was then placed on it by A. L. Petrucci, graduate assistant in the Geography Department, who also prepared maps 2 and 5.
Great Lakes. Distribution of Old Copper Spec. This map showing the distribution of old copper specimens is somewhat arbitrary in its boundary line. For example, there are known copper specimens in central New York which have not been included. There are also some copper artifacts in the Southeast in Late Archaic sites, which were, apparently, traded into that area. We are particularly indebted to Mrs. P. H. Stokes and P. W. Grant of Winnipeg, Mani