The element selenium has been found to be the cause livestock and poultry poisioning in several Great Plains states, including South Dakota. The occurrence of the element has been recently noted in wheat grown on soils derived from glacial materials in Saskatchewan. Analyses of plants from glaciated areas in Montana, North Dakota, and Canada indicate the occurrence of selenium in noteworthy amounts in glacial deposits and in soils derived from them. Laboratory studies of glacial and associated materials, soils derived from them, and the indicator plant Astragalus racemosus were made to determine the amounts of selenium present. In order to determine the geographic distribution of selenium and its significance, Pleistocene deposits were investigated and their origin determined as far as possible.
South Dakota State University
Searight, Walter V. and Moxon, Alvin L., "Selenium in Glacial and Associated Deposits" (1945). Agricultural Experiment Station Technical Bulletins (1939-2011). 17.