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Keweenawan Supergroup information


The Keweenawan Supergroup is a supergroup of volcanic and sedimentary rocks that fill the Midcontinent Rift System in the U.S. states of Michigan, Wisconsin, and Minnesota.[1][2] It is about 30 kilometers (19 mi) thick and it formed about 1.1 billion years ago.[3]

  1. ^ Cite error: The named reference N505 was invoked but never defined (see the help page).
  2. ^ "Geologic Unit: Keweenawan". GEOLEX Database. United States Geological Survey. Retrieved June 20, 2012.
  3. ^ "Geology of the Porcupine Mountains" (PDF). Michigan Department of Natural Resources. p. 1. Archived from the original (PDF) on January 18, 2012. Retrieved June 19, 2012.

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Keweenawan Supergroup

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The Keweenawan Supergroup is a supergroup of volcanic and sedimentary rocks that fill the Midcontinent Rift System in the U.S. states of Michigan, Wisconsin...

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Laurentia

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rifted apart along the Midcontinent Rift System. This produced the Keweenawan Supergroup, whose flood basalts are rich in copper ore. Laurentia was formed...

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Oronto Group

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much as 21,000 ft (6,400 m) deep. The group is a member of the Keweenawan Supergroup. The Oronto Group has a higher proportion of undecomposed minerals...

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Bayfield group

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higher feldspar concentration. The Bayfield group is a member of the Keweenawan Supergroup. The Bayfield group is a predominantly red sandstone, though it...

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Duluth Complex

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of the rift. The rock sequences thereby created are known as the Keweenawan Supergroup. Rocks of this group north of Lake Superior are the layers of the...

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Interstate Park

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the surface within Interstate Park. The oldest strata are of the Keweenawan Supergroup, which is a 2.5 miles (4.0 km) thick sequence of volcanic and sedimentary...

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Jacobsville Sandstone

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above the Oronto Group. The formation is an upper member of the Keweenawan Supergroup. Jacobsville Sandstone varies from horizontal to gently inclined...

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Geology of Wisconsin

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granite occur near Wausau. Between 1.1 and one billion years ago, the Keweenawan Supergroup formed, which now underlies northern Wisconsin, inland and south...

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Penokean orogeny

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lasted about 10 million years. Hundreds of millions of years later, the Keweenawan Rift occurred in the same area creating the basin that would eventually...

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Copper mining in the United States

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19th century for native copper deposits in Keweenawan-series rocks, similar to deposits found in Keweenawan rocks in Michigan. A number of mines were started...

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Timeline of natural history

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formation of Gamburtsev mountain range and Vostok Subglacial Highlands. Keweenawan Rift buckles in the south-central part of the North American plate – leaves...

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