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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.
The Fairburn Agate is a type of gemstone found in the agate beds of Southwestern South Dakota and Northwestern Nebraska. It is also the state gemstone of South Dakota. [1] Fairburns are characterized from other types of agate by their colors and the shape of the bands. [1] [2]
According to the South Dakota State Historical Society's Archaeological Research Center, over 26,000 archaeological sites have been recorded in the U.S. state of South Dakota. [ 1 ] This list is broken down by county and encompasses sites across all of what is now South Dakota.
The National Grasslands Visitor Center in Wall, South Dakota is part of the Buffalo Gap National Grassland – Wall Ranger District. The center features exhibits about grassland wildlife and plants, grazing management and the history of the Great Plains. There is also a theater with a video about the grasslands, restrooms and a gift shop.
[1]: 189–190 Ten years later, in 1877, a scout and rancher named Captain James H. Cook discovered a Miocene bone bed in Sioux County now known as the Agate Springs Quarries or Agate Bone Beds. These rich deposits are so dense with bones that a single forty foot slab of sandstone preserved more than 4,300 bones from at least 1,700 individual ...
The Jurassic-Cretaceous boundary is seen where the red and purple beds of the Morrison Formation abruptly contact the drab, gray bed of the overlying Cedar Mountain Formation. The contact is the K1 unconformity. Jessie's Twist, southwest of Green River City, Utah. Brushy Basin Member showing the purple and red colors of paleosols (ancient soils).
South Dakota also contains numerous state parks, all of which are managed by the South Dakota Department of Game, Fish, and Parks. Custer State Park in the Black Hills is a large state park with over 71,000 acres, and includes Sylvan Lake , Needles Highway , and a wildlife loop featuring a large bison herd and the "begging burros", [ 65 ] among ...
Various ash falls were locally deposited, supplying silica for the formation of agate and chert in the upper portion and opal in the lowest portion. Other than the lower opaline sandstone zone and the "Algal limestone", the Ogallala has no persistent lithological marker beds beyond the stated generalities of local chert beds in the upper zone ...