Early Proterozoic and Precambrian-Cambrian unconformities of the Nemo area, Black Hills, South Dakota
Jack A. Redden, 1987. "Early Proterozoic and Precambrian-Cambrian unconformities of the Nemo area, Black Hills, South Dakota", Rocky Mountain Section of the Geological Society of America, Stanley S. Beus
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Excellent exposures of both an early Proterozoic uncon formity and the Precambrian-Cambrian unconformity occur in the Nemo area along the eastern side of the Precambrian core of the Black Hills approximately 18 mi (30 km) northwest of Rapid City (Fig. 1). Although the two unconformities are exposed relatively near one another, there is approximately 1.5 Ga difference in their ages. The lithologies and structure of these localities permit significant inferences about tectonic events and geologic history of the Black Hills.
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Rocky Mountain Section of the Geological Society of America
One of six volumes generated by each GSA section for the Decade of North American Geology (DNAG) project, this Centennial Field Guide contains descriptions of 100 sites or site clusters representing outstanding geologic locations in northern Arizona, Colorado, Idaho, Montana, North Dakota, New Mexico, South Dakota, Utah, Wyoming, and Alberta.