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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 south-central part of the North American plate. It formed when the continent's core, the North American craton , began to split apart during the Mesoproterozoic era of the Precambrian , about 1.1 ...
One billion years ago, the Midcontinent Rift System began to extend along a 2,000 kilometres (1,200 mi) path, [10] across both the Canadian Shield and the Stable Platform. The rift failed, then crustal movement reversed. A range formed then eroded, forming basins on either side of a horst.
Iowa magnetic anomaly map showing the Midcontinent Rift curving from the north center to the southwest part of the state. [8]Buried deeply within Iowa's bedrock, the Midcontinent Rift System can be seen clearly in magnetic anomaly maps of Iowa.
[4]: 7 This zone of crustal thinning and fracturing is the Midcontinent Rift System; it extends in a boomerang shape for over 2,200 km (1,400 mi) from northeastern Kansas northward through Iowa, under the Twin Cities of Minnesota, beneath Lake Superior, and then south through the eastern Upper Peninsula of Michigan and beneath the central Lower ...
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The Mesabi and Gunflint Ranges, once part of a single mountain range, were split when the center was engulfed by magma blistering up during the Midcontinent Rift, creating the Duluth Complex. Lava from the rift formed dense volcanic rocks which sank, creating the Lake Superior basin, edged by the North Shore Volcanic Group along the lakeshore.
Midcontinent Rift System; N. Nipigon Embayment; P. Purus Arch; S. Lake Superior; W. White Sea Rift System This page was last edited on 2 November 2023, at 23: ...
Physiographic Map from "Geography of Ohio," published in 1923. During the early 1900s, the study of regional-scale geomorphology was termed "physiography". Physiography later was considered to be a portmanteau of "physical" and "geography", and therefore synonymous with physical geography, and the concept became embroiled in controversy surrounding the appropriate concerns of that discipline.