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KEWEENAWAN SUPERGROUP

Keweenawan Supergroup

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

Keweenawan Supergroup

Keweenawan_Supergroup

Stenian

Last period of the Mesoproterozoic Era

formation of the Keweenawan Rift (the deepest failed rift on Earth) at about 1100 Mya, in which the rocks of the Keweenawan Supergroup are preserved. Elsewhere

Stenian

Laurentia

Craton forming the geological core of North America

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

Laurentia

Oronto Group

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

Oronto Group

Oronto_Group

Keweenaw (disambiguation)

Topics referred to by the same term

Keweenaw Rocket Range Keweenaw Underwater Preserve Keweenaw Waterway Keweenawan Supergroup keweenawite This disambiguation page lists articles associated with

Keweenaw (disambiguation)

Keweenaw_(disambiguation)

Geology of Wisconsin

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

Geology of Wisconsin

Geology_of_Wisconsin

Duluth Complex

Rock formation in Minnesota

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

Duluth Complex

Duluth_Complex

Bayfield group

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

Bayfield group

Bayfield_group

Interstate Park

United States historic place

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

Interstate Park

Interstate_Park

Jacobsville Sandstone

Geologic formation in North America

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

Jacobsville Sandstone

Jacobsville_Sandstone

Penokean orogeny

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

Penokean orogeny

Penokean_orogeny

Timeline of Earth

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

Timeline of Earth

Timeline_of_Earth

Copper mining in the United States

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

Copper mining in the United States