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The sandstone has been variously called redstone, brownstone, Lake Superior Sandstone, and Eastern Sandstone. In 1907, the Jacobsville Formation was given its current classification and the name Jacobsville , in honor of Jacobsville, Michigan , a town known for its production of the sandstone.
Most of Lake Superior lies within the basin of the Midcontinent Rift. The rocks of Lake Superior's northern shore date back to the early history of the earth. During the Precambrian (between 4.5 billion and 540 million years ago) magma forcing its way to the surface created the intrusive granites of the Canadian Shield. [36]
The ore is generally shipped by lake freighters to locations on the lower Great Lakes. Many steelmaking centers are near Lake Erie. Due to increased international demand, taconite is shipped to Mexico and China. [3] The SS Edmund Fitzgerald, which sank in Lake Superior on November 10, 1975, was carrying about 26,116 long tons of taconite ...
The Gunflint chert (1.88 Ga [1]) is a sequence of banded iron formation rocks that are exposed in the Gunflint Range of northern Minnesota and northwestern Ontario along the north shore of Lake Superior. The Gunflint Chert is of paleontological significance, as it contains evidence of microbial life from the Paleoproterozoic. [2]
The Au Sable Light Station was built in 1874 [8] on Au Sable Point, a well known hazard on Lake Superior's "shipwreck coast". The Au Sable Point reef is a shallow ridge of sandstone that in places is only 6 feet (1.8 m) below the surface and extends nearly 1 mile (1.6 km) into Lake Superior. The Au Sable Point reef was one of the greatest ...
Pictured Rocks National Lakeshore is a U.S. National Lakeshore in the Upper Peninsula of Michigan, United States. It extends for 42 mi (68 km) along the shore of Lake Superior and covers 73,236 acres (114 sq mi; 296 km 2).
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The buff area on the north margin is the Lake Nipigon area. The rock formations created by the rift included gabbro and granite intrusive rocks and basalt lavas. [4] In the Lake Superior region, the upwelling of this molten rock may have been the result of a hotspot which produced a triple junction. [2] The hotspot domed the rocks of the Lake ...