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]
^Cite error: The named reference N505 was invoked but never defined (see the help page).
^"Geologic Unit: Keweenawan". GEOLEX Database. United States Geological Survey. Retrieved June 20, 2012.
^"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.
and 11 Related for: Keweenawan Supergroup information
The KeweenawanSupergroup is a supergroup of volcanic and sedimentary rocks that fill the Midcontinent Rift System in the U.S. states of Michigan, Wisconsin...
rifted apart along the Midcontinent Rift System. This produced the KeweenawanSupergroup, whose flood basalts are rich in copper ore. Laurentia was formed...
much as 21,000 ft (6,400 m) deep. The group is a member of the KeweenawanSupergroup. The Oronto Group has a higher proportion of undecomposed minerals...
higher feldspar concentration. The Bayfield group is a member of the KeweenawanSupergroup. The Bayfield group is a predominantly red sandstone, though it...
of the rift. The rock sequences thereby created are known as the KeweenawanSupergroup. Rocks of this group north of Lake Superior are the layers of the...
above the Oronto Group. The formation is an upper member of the KeweenawanSupergroup. Jacobsville Sandstone varies from horizontal to gently inclined...
the surface within Interstate Park. The oldest strata are of the KeweenawanSupergroup, which is a 2.5 miles (4.0 km) thick sequence of volcanic and sedimentary...
granite occur near Wausau. Between 1.1 and one billion years ago, the KeweenawanSupergroup formed, which now underlies northern Wisconsin, inland and south...
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...
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...
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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