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The geology of South Dakota began to form more than 2.5 billion years ago in the Archean eon of the Precambrian. Igneous crystalline basement rock continued to emplace through the Proterozoic , interspersed with sediments and volcanic materials.
South Dakota is the 17th-largest state in the country. South Dakota has a humid continental climate in the east and the Black Hills, and a semi-arid climate in the west outside of the Black Hills, featuring four very distinct seasons, and the ecology of the state features plant and animal species typical of a North American temperate grassland ...
The Deadwood Formation is a geologic formation of the Williston Basin and Western Canada Sedimentary Basin.It is present in parts of North and South Dakota and Montana in the United States, and in parts of Alberta, Saskatchewan, and southwestern corner of Manitoba in Canada.
Baculites from the Pierre Shale showing sutures and remnant aragonite; western South Dakota, Late Cretaceous. The Pierre Shale is a geologic formation or series in the Upper Cretaceous which occurs east of the Rocky Mountains in the Great Plains , from Pembina Valley in Canada [ 2 ] to New Mexico .
Stratigraphy of South Dakota (2 C, 1 P) Pages in category "Geology of South Dakota" The following 10 pages are in this category, out of 10 total.
The Hell Creek Formation is an intensively studied geological formation of mostly Upper Cretaceous and some Early Paleocene rocks in North America, named for exposures studied along Hell Creek, near Jordan, Montana. The formation stretches over portions of Montana, North Dakota, South Dakota, and Wyoming.
The Tin Mountain pegmatite is an igneous intrusion located in the southern Black Hills, South Dakota. It is a part of the Harney Peak Granite dome that formed in the Late Paleoproterozoic around 1.7 billion years ago. [1] [2] [3] The Harney Peak Granite system includes thousands of pegmatites, one of which is the Tin Mountain. [1]
Bear Butte is a geological laccolith feature located near Sturgis, South Dakota, United States, that was established as a State Park in 1961. An important landmark and religious site for the Plains Indians tribes long before Europeans reached South Dakota, Bear Butte is called Matȟó Pahá, [2] or Bear Mountain, by the Lakota, or Sioux.