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Selenium in Soils and Vegetation Associated with Rocks of Permian and Triassic Age
O. A. Beath, C. S. Gilbert and H. F. Eppson
American Journal of Botany
Vol. 24, No. 2 (Feb., 1937), pp. 96-101
Published by: Botanical Society of America, Inc.
Stable URL: http://www.jstor.org/stable/2436728
Page Count: 6
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The occurrence of selenium in the basal Chugwater and equivalent rocks has been traced from the southeastern part of Wyoming to the western border. In the several facies geologically designated as "The Little Medicine tongue of the Dinwoody," the "Embar," the Dinwoody, and the Phosphoria, and the Woodside and the Phosphoria, selenium has been found to occur in rocks and shales of each unit, with the possible exception of the Woodside. In three areas certain seleniferous native range plants were found in profuse abundance. In the fourth area in the Phosphoria of western Wyoming selenium was found to occur in a "spotty" condition in the phosphate rock. The lighter-colored, high-grade rock from Crawford Mountain and the Beckwith Hills was practically non-seleniferous, yielding only one part per million selenium or less. From the data obtained, it is evident that selenium is definitely a primary constituent of stratigraphically equivalent rocks of Permian and Triassic age. With the possible exception of the Woodside formation, selenium occurs in rock successions which are believed to be stratigraphical equivalents by leading authorities.
American Journal of Botany © 1937 Botanical Society of America, Inc.