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Agate Fossil Beds National Monument is a U.S. National Monument near Harrison, Nebraska. The main features of the monument are a valley of the Niobrara River and the fossils found on Carnegie Hill and University Hill. The area largely consists of grass-covered plains.
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.
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 ...
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.
Isle Royale is the least-visited national park in the contiguous United States, [36] due to the winter closing and the distance across Lake Superior to reach the park. The average annual visitation was about 19,000 in the period from 2009 to 2018, with 25,798 visiting in 2018. [ 2 ]
Crawford Notch State Park is located on U.S. Highway 302, in northern New Hampshire, between Bretton Woods and Bartlett.The 5,775-acre (2,337 ha) park occupies the center of Crawford Notch, a major pass through the White Mountains.
Michigan's fossil record stretches as far back as the Precambrian. [1] Blue-green algae remains from this age were preserved between Copper Harbor and Eagle Harbor on the shoreline of Lake Superior. [1] By the early part of the Paleozoic, Michigan was located in equatorial latitudes. [2]