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Petrogenesis of Archean (2.7 Ga) Mafic Volcanic Assemblages Near Ely, MN
The Vermilion District in northeastern Minnesota contains one of the classic Neoarchean Archean granite-greenstone belt terranes in the United States that formed between 2722 Ma to ~2661 Ma. Crustal development during ...
Regional Geochemical Analysis of Lower Paleozoic Strata, Western Wisconsin
Lower Paleozoic clastic strata of western Wisconsin were deposited during a series of transgressive marine incursions into the mid-continent in Cambrian to Ordovician time. These strata consist of intercalated sandstone, ...