Search results
Results from the WOW.Com Content Network
Three distinct layers of lava can be seen from the highway bridge. The lower flows were more compact and hard, but the upper flows were vesicular, containing pockets that later filled with various minerals including those that formed the Lake Superior agates which can be found along the beach where the river ends in Lake Superior. [3]
Lake Superior Agate - Duluth, Minnesota. 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.
The Grand Sable Dunes today form a five-mile-long sand slope that rises from Lake Superior at a 35° angle. The summits of the tallest dunes are as high as 275 feet (85 m) above lake level. Glacial melt during the last major advance/retreat called the Marquette Readvance created the conditions for the formation of the Grand Sable Banks.
Tettegouche State Park (/ ˈ t ɛ t ə ɡ uː tʃ / TET-ə-gooch) is a Minnesota state park on the north shore of Lake Superior 58 miles (93 km) northeast of Duluth in Lake County on scenic Minnesota Highway 61. The park's name stems from the Tettegouche Club, an association of local businessmen which purchased the park in 1910 from the Alger ...
Judge C. R. Magney State Park is a state park in the U.S. state of Minnesota, on the North Shore of Lake Superior.It was named for Clarence R. Magney, a former mayor of Duluth and justice of the Minnesota Supreme Court, who was instrumental in getting 11 state parks and scenic waysides established along the North Shore. [2]
In 1897, the county was dissolved, and the island was reincorporated into Keweenaw County. The highest point on the island is Mount Desor at 1,394 ft (425 m), or about 800 ft (240 m) above lake level. Isle Royale, the largest island in Lake Superior, is over 45 mi (72 km) in length and 9 mi (14 km) wide at its widest point. [6]
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 Pictured Rocks, although an exceptionally scenic section of Lake Superior shoreline, offers very little shelter to storm-beset boat traffic of all kinds; over the years, some of these boats and Lake freighters have wrecked.