Keweenaw Fault
The Keweenaw Fault is a reverse fault that bisects the Keweenaw Peninsula of the Upper Peninsula of Michigan.[1] The fault is the boundary between the Midcontinent Rift System and adjacent Precambrian terrain. The peninsula, itself, is the southeastern side of a large syncline beneath Lake Superior. The northwestern side forms Isle Royale.[2]
The fault is more than 100 miles (160 kilometers) long and traces a northwesterly path.[3] The fault is most likely younger than the Jacobsville Formation and the Devonian Period.[4]
An seismic event in 1906 claimed to be an earthquake has been attributed to a rock burst, as the area has been significantly mined.[5]
The Natural Wall
One significant feature along the Keweenaw Fault is known as the Natural Wall. The Wall is a near-vertical slope of sandstone at a maximum inclination of 85°.[6]
References
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