• Thumbnail for Midcontinent Rift System
    The Midcontinent Rift System (MRS) or Keweenawan Rift is a 2,000 km (1,200 mi) long geological rift in the center of the North American continent and...
    16 KB (1,636 words) - 19:32, 25 May 2025
  • Thumbnail for Geology of North America
    Midcontinent Rift System began to extend along a 2,000 kilometres (1,200 mi) path, across both the Canadian Shield and the Stable Platform. The rift failed...
    34 KB (3,380 words) - 01:53, 25 May 2025
  • and incorporated into continental crust. Aulacogens such as the Midcontinent Rift System of North America are also viable sources of rocks which may undergo...
    21 KB (2,225 words) - 21:32, 24 May 2025
  • Thumbnail for Rift
    Yukon and Alaska The West Antarctic Rift System in Antarctica The Midcontinent Rift System, a late Precambrian rift in central North America The Midland...
    22 KB (2,531 words) - 04:03, 25 May 2025
  • Thumbnail for Volcanism of Eastern Canada
    began to split apart to form the Midcontinent Rift System, also called the Keweenawan Rift. Lava flows created by the rift in the Lake Superior area were...
    17 KB (1,821 words) - 06:13, 31 May 2023
  • Nipigon Embayment (category Mesoproterozoic rifts and grabens)
    continental rift zone in Northwestern Ontario, Canada, centered on Lake Nipigon. It represents an aulacogen of the much larger Midcontinent Rift System, which...
    843 bytes (86 words) - 22:17, 22 July 2023
  • is a supergroup of volcanic and sedimentary rocks that fill the Midcontinent Rift System in the U.S. states of Michigan, Wisconsin, and Minnesota. It is...
    3 KB (255 words) - 03:36, 2 May 2023
  • Thumbnail for Horst (geology)
    to folded regions such as some mountain chains of Eurasia. The Midcontinent Rift System in North America is marked by a series of horsts extending from...
    8 KB (821 words) - 15:46, 26 May 2025
  • Thumbnail for Lake Nipigon
    Nipigon diabase sills give evidence of rift-related continental basaltic magmatism during the Midcontinent Rift System event, estimated at 1,109 Ma ago. Thick...
    26 KB (3,028 words) - 13:40, 30 May 2025
  • Thumbnail for Duluth Complex
    are intrusive rocks formed about 1.1 billion years ago during the Midcontinent Rift; these adjoin and are interspersed with the extrusive rocks of the...
    24 KB (2,457 words) - 23:30, 10 January 2024
  • Thumbnail for Geology of Minnesota
    waters. Over 1,100 mya, a rift formed and lava emerged from cracks along the edges of the rift valley. This Midcontinent Rift System extended from the lower...
    48 KB (5,040 words) - 01:26, 26 May 2025
  • Thumbnail for Great Lakes
    of the triple junction (centered beneath Lake Superior) in the Midcontinent Rift System event, estimated at 1.1 billion years ago. Thunder Bay is a large...
    119 KB (12,432 words) - 14:24, 2 June 2025
  • Thumbnail for Nemaha Ridge
    Humboldt Fault zone. It is also associated with the Proterozoic Midcontinent Rift System, which extends into northern Kansas about fifty miles west of the...
    3 KB (265 words) - 00:02, 17 October 2024
  • Thumbnail for Geography of Iowa
    Ordovician meteor event. Buried deeply within Iowa's bedrock, the Midcontinent Rift System can be seen clearly in magnetic anomaly maps of Iowa. This is a...
    33 KB (3,269 words) - 10:31, 27 May 2025
  • Thumbnail for Keweenaw Fault
    of the Midcontinent Rift System onto sedimentary rocks of the Jacobsville Sandstone. The fault is part of the inversion of the Midcontinent Rift where...
    5 KB (436 words) - 17:03, 20 March 2025
  • volcanic in origin, having been deposited by volcanism of the Midcontinent Rift System. Volcanism of Canada Volcanism of Eastern Canada Hart, Thomas R;...
    1 KB (135 words) - 19:33, 26 May 2025
  • Aulacogen (redirect from Failed rift)
    Hibernia Oil Field is located.[citation needed] The Stenian period Midcontinent Rift System that is still visible at the surface in the area of Lake Superior...
    10 KB (1,171 words) - 12:47, 27 December 2024
  • features are situated in the Southern Province, including the Midcontinent Rift System and the Sudbury Igneous Complex. Geology of Ontario Geology of...
    1 KB (96 words) - 23:49, 23 February 2024
  • Thumbnail for Lake Superior agate
    agates formed within the basaltic lava flows left behind from the Midcontinent Rift about 1.1 billion years ago. They are not named after the lake, but...
    8 KB (856 words) - 10:59, 7 March 2025
  • and deepest rifts and valleys in various worlds of the Solar System. List of Solar System extremes List of largest craters in the Solar System List of tallest...
    7 KB (155 words) - 03:24, 6 May 2024
  • Thumbnail for Mount McKay
    during a period of magmatic activity associated with the large Midcontinent Rift System about 1,100 million years ago. McKay is traditionally known as...
    7 KB (666 words) - 19:05, 13 February 2025
  • Marathon. It is thought to have formed by the Midcontinent Rift System, a 2,000 km (1,243 mi) long rift in the centre of the North American continent...
    1 KB (92 words) - 19:38, 1 August 2023
  • Thumbnail for Graben
    Graben (category Rifts and grabens)
    Valley (Arizona), U.S. Eastern North America Rift Basins, Canada and the U.S. Midcontinent Rift System, Canada and the U.S. Salton Trough, Mexico and...
    8 KB (857 words) - 19:32, 24 May 2025
  • Thumbnail for Rift valley
    lies in the ancient and dormant Midcontinent Rift. The largest subglacial lake, Lake Vostok, may also lie in an ancient rift valley. Lake Nipissing and Lake...
    12 KB (1,359 words) - 11:40, 18 November 2024
  • of 25 km (16 mi). The Coldwell Complex has its origins in the Midcontinent Rift System about 1,100 million years ago. It is an exposed magma chamber that...
    2 KB (215 words) - 14:57, 16 January 2023
  • older than tholeiitic basalts and rhyolites of Middle Proterozoic Midcontinent Rift System. Age of 1370 ±20 Ma for samples from Spavinaw Creek outcrop in:...
    2 KB (186 words) - 22:09, 22 July 2023
  • south of the Great Lakes tectonic zone in Minnesota, south of the Midcontinent Rift System in Wisconsin and in the Upper Peninsula of Michigan.: 1  Crystalline...
    35 KB (3,741 words) - 17:19, 23 May 2025
  • Thumbnail for Michipicoten Island
    is made up of ancient lava bedrock related to volcanism of the Midcontinent Rift System and is heavily forested, with over 20 inland lakes. It has a rugged...
    16 KB (1,430 words) - 03:31, 20 February 2025
  • Thumbnail for Erie Canal
    watercraft. It connects the three other canals in the New York State Canal System: the Champlain, Oswego, and Cayuga–Seneca. Some long-distance boaters take...
    102 KB (10,890 words) - 00:52, 3 June 2025
  • proto-North American continent nearly split in half along the Midcontinent Rift, which is a bow-shaped rift extending from northeast Kansas, arcing through the...
    40 KB (4,880 words) - 04:50, 1 June 2025