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Glauconite from the Precambrian Belt Series, Montana |
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| Authors: | Gulbrandsen R A Goldich S S Thomas H H |
| Abstract: | Glauconite from the upper part of the Missoula Group of the Belt Series, Flathead County, Montana, has been dated at 1070 million years by potassium-argon and rubidium-strontium analyses. This is the first glauconite of Precambrian age reported in North America. |
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