Mineral Resources
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Basement domains of the conterminous US and Alaska
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Mid-continent
Basement domain in the Central and Southwest
Geologic information
Region
Central and Southwest
Alternate names
Keweenawan
Crust
Type:
Intracontinental rift
Formation age:
1100-1000 Ma
Geographic extent
Adair
,
Adams
,
Allamakee
,
Audubon
,
Benton
,
Black Hawk
,
Boone
,
Bremer
,
Buchanan
,
Butler
,
Calhoun
,
Carroll
,
Cass
,
Cerro Gordo
,
Chickasaw
,
Clarke
,
Clayton
,
Crawford
,
Dallas
,
Delaware
,
Fayette
,
Floyd
,
Franklin
,
Fremont
,
Greene
,
Grundy
,
Guthrie
,
Hamilton
,
Hancock
,
Hardin
,
Harrison
,
Howard
,
Humboldt
,
Ida
,
Jasper
,
Jones
,
Kossuth
,
Linn
,
Madison
,
Mahaska
,
Marion
,
Marshall
,
Mills
,
Mitchell
,
Monona
,
Montgomery
,
Page
,
Pocahontas
,
Polk
,
Pottawattamie
,
Poweshiek
,
Ringgold
,
Sac
,
Shelby
,
Story
,
Tama
,
Taylor
,
Union
,
Warren
,
Webster
,
Winnebago
,
Winneshiek
,
Worth
,
Wright
,
Alger
,
Alpena
,
Antrim
,
Charlevoix
,
Cheboygan
,
Chippewa
,
Emmet
,
Gogebic
,
Houghton
,
Keweenaw
,
Luce
,
Mackinac
,
Montmorency
,
Ontonagon
,
Otsego
,
Presque Isle
,
Schoolcraft
,
Aitkin
,
Anoka
,
Blue Earth
,
Carlton
,
Carver
,
Chisago
,
Cook
,
Dakota
,
Dodge
,
Faribault
,
Fillmore
,
Freeborn
,
Goodhue
,
Hennepin
,
Houston
,
Isanti
,
Kanabec
,
Lake
,
Le Sueur
,
McLeod
,
Mower
,
Nicollet
,
Olmsted
,
Pine
,
Ramsey
,
Rice
,
Saint Louis
,
Scott
,
Sherburne
,
Sibley
,
Steele
,
Wabasha
,
Waseca
,
Washington
,
Winona
,
Wright
,
Atchison
,
Nodaway
,
Cass
,
Dodge
,
Douglas
,
Gage
,
Johnson
,
Lancaster
,
Otoe
,
Saline
,
Sarpy
,
Saunders
,
Seward
,
Washington
,
Ashland
,
Barron
,
Bayfield
,
Buffalo
,
Burnett
,
Douglas
,
Dunn
,
Iron
,
Pepin
,
Pierce
,
Polk
,
Saint Croix
,
Sawyer
,
Trempealeau
,
Washburn
Bibliographic references
Van Schmus, W.R., and Hinze, W.J., 1985, The Midcontinent rift system: Annual Reviews of Earth and Planetary Science, v. 13, p. 345–383.
Sims, P.K., Kisvarsanyi, E.B., and Morey, G.B., 1987, Geology and metallogeny of Archean and Proterozoic basement terranes in the northern midcontinent, U.S.A.—An overview: U.S. Geological Survey Bulletin 1815, 51 p.
Van Schmus, W.R., Schneider, D.A., Holm, D.K., Dodson, S., and Nelson, B.K., 2007, New insights into the southern margin of the Archean-Proterozoic boundary in the north-central United States based on U–Pb, Sm–Nd, and Ar–Ar geochronology: Precambrian Research, v. 157, p. 80–105.