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Showing 1 to 1 of 1 for “"Selenium; Geology--North Dakota; Geology"”.
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Origin and distribution of selenium in the upper Cretaceous Niobrara and Pierre formations, northeastern North Dakota
<p> High concentrations of selenium, often as much as 28 ppm, have been found in the bentonitic zones near the contact of the Niobrara and Pierre Formations of Cretaceous age in northeastern North Dakota. A 64-foot section in the Pembina Hills area reveals that the highest selenium content occurs …