The Midcontinent Rift System or Keweenawan Rift is a 2,000 km long geological rift in the center of the North American continent and south-central part of the North American plate. It formed when the
Rift rocks are exposed in the buff-colored areas around Lake Superior (black). The buff area on the north margin is the Lake Nipigon area.
Volcanic strata protrude at Isle Royale and the Keweenaw Peninsula
Sleeping Giant in Ontario
Eroded volcanic strata at Isle Royale in Michigan
The Great Lakes, also called the Great Lakes of North America, are a series of large interconnected freshwater lakes spanning the Canada–United States border. The five lakes are Superior, Michigan, Hu
Midcontinent Rift System
…geologic feature is the 2,700,000 km2 (1,000,000 mi2) Mackenzie Large Igneous Province in Canada, which extends from the Arctic in Nunavut to near the Great Lakes in Northwestern Ontario. The Proterozoic Nonesuch Shale formation in the Keweenawan Rift contains enough organic carbon (greater than 0.5%) to be…
The Great Lakes seen from NASA's Aqua satellite in August 2010. From left to right: Lake Superior, Michigan, Huron, Erie, Ontario
Chicago on Lake Michigan is in the western part of the lakes megalopolis and the site of the waterway linking the lakes to the Mississippi River valley
Lake Michigan–Huron with north oriented to the right; taken on April 14, 2022, during Expedition 67 of the International Space Station. Green Bay is at the upper right and Saginaw Bay is on the left.
South Bass Island in Lake Erie