- Keweenawan
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The younger division of the Proterozoic eon as represented by rocks in the Great Lakes region of the United States
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Keweenawan
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Keweenawan System — ▪ geochronology division of late Precambrian rocks and time in North America (the Precambrian began about 3.8 billion years ago and ended 540 million years ago). Rocks of the Keweenawan System are about 10,700 metres (about 35,000 feet)… … Universalium
keweenawan — ke·wee·naw·an … English syllables
keweenawan — |kēwē|nȯən adjective Usage: usually capitalized Etymology: Keweenaw Point, Mich. + English an : of or relating to a division of the Proterozoic see geologic time table … Useful english dictionary
Midcontinent Rift System — Geological map of North America showing (in white) the Midcontinent Rift, here labeled Keweenawan Rift. Lake Superior occupies the apex of the rift. The Midcontinent Rift System (MRS) or Keweenawan Rift is a 2,000 km (1,200 mi) long… … Wikipedia
Beaver-Bay-Komplex — Das schattierte Reliefbild zeigt den Duluth Komplex, der sich bogenförmig von Duluth zum Pigeon Point zieht und dabei die Mesabi Range und die Gunflint Range unterbricht Der Duluth Komplex, der damit verbundene Beaver Bay Komplex (der oft als… … Deutsch Wikipedia
North Shore Volcanic Group — Das schattierte Reliefbild zeigt den Duluth Komplex, der sich bogenförmig von Duluth zum Pigeon Point zieht und dabei die Mesabi Range und die Gunflint Range unterbricht Der Duluth Komplex, der damit verbundene Beaver Bay Komplex (der oft als… … Deutsch Wikipedia
Duluth-Komplex — Das schattierte Reliefbild zeigt den Duluth Komplex, der sich bogenförmig von Duluth zum Pigeon Point zieht und dabei die Mesabi Range und die Gunflint Range unterbricht Der Duluth Komplex, der damit verbundene Beaver Bay Komplex (der oft als… … Deutsch Wikipedia
Duluth Complex — Shaded relief image showing Duluth Complex arcing from Duluth to Pigeon Point, interrupting and splitting the Mesabi and Gunflint Ranges The Duluth Complex, the related Beaver Bay Complex (often treated as part of the Duluth Complex),[1] and the… … Wikipedia
Copper mining in the United States — US primary copper production 1900 2008. Source: USGS … Wikipedia
Copper mining in Michigan — While it originated thousands of years earlier, copper mining in Michigan became an important industry in the 19th and early 20th centuries. Its rise marked the start of copper mining as a major industry in the United States. Contents 1 Geology 2 … Wikipedia
