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The Lake Superior agate is a type of agate stained by iron and found on the shores of Lake Superior. Its wide distribution and iron-rich bands of color reflect the gemstone's geologic history in Minnesota, Wisconsin, Nebraska, Iowa, Kansas, and Michigan. In 1969 the Lake Superior agate was designated by the Minnesota Legislature as the official ...
Jacobsville Sandstone is a red sandstone formation, marked with light-colored streaks and spots, primarily found in northern Upper Michigan, portions of Ontario, and under much of Lake Superior. Desired for its durability and aesthetics, the sandstone was used as an architectural building stone in both Canada and the United States.
Chlorastrolite occurs as amygdaloid structures and fracture fillings in basalt, and when the water and wave action has worn away the basalt, they are found as beach pebbles and granules in loose sediments. It is found in the Keweenaw Peninsula of the Upper Peninsula of Michigan and Isle Royale in Lake Superior. Isle Royale is a National Park ...
Spray Falls—This waterfall is best seen from Lake Superior. The 1856 shipwreck of the Superior is at the base of the falls in 20 feet (6.1 m) of water. [14] Sable Falls - Sable Falls tumbles 75 feet (23 m) over several cliffs of Munising and Jacobsville sandstone formations on its way to Lake Superior. [14]
Map of Minnesota bedrock by age. Shaded relief image: Superior Upland in the northeast, the flat Red River Valley in the northwest, Central Minnesota's irregular landscape, the Coteau des Prairies and Minnesota River in the southwest, and the southeast's dissected Driftless Area along the Mississippi River below its confluences with the Minnesota and St. Croix in East Central Minnesota
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]
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The Stannard Rock Reef is located off Keweenaw Peninsula about 24 miles (39 km) south of Manitou Island and 44 miles (71 km) north of Marquette, Michigan. [1] [10] In 1835, Captain Charles C. Stannard of the vessel John Jacob Astor first discovered this underwater mountain that extends for 0.25 miles (0.40 km) with depths as shallow as 4 feet (1.2 m) and averaging 16 feet (4.9 m).