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The data on this CD consist of geographic information system (GIS)coverages and tabular data on the geology of Early Proterozoic andArchean rocks in part of the Early Proterozoic Penokean orogeny.The map emphasizes metasedimentary and metavolcanic rocks that weredeposited along the southern margin of the Superior craton and werelater deformed during continental collision at about 1850 Ma. Thearea includes the famous iron ranges of the south shore region ofthe Lake Superior district. Base maps, both as digital rastergraphics (DRG) and digital line graphs (DLG) are also provided forthe convenience of users. The map has been compiled from manyindividual studies, mostly by USGS researchers, completed during thepast...
Tags: 1100 - Geology, 1101 - General, 26003 = Alger, 26013 = Baraga, 26043 = Dickinson, All tags...


    map background search result map search result map Digital Geologic Map of the Penokean Continental Margin, Northern Michigan and Wisconsin Digital Geologic Map of the Penokean Continental Margin, Northern Michigan and Wisconsin