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Science 26 April 1963:
Vol. 140. no. 3565, pp. 390 - 391
DOI: 10.1126/science.140.3565.390
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Articles

Glauconite from the Precambrian Belt Series, Montana

R. A. Gulbrandsen 1, S. S. Goldich 2, and H. H. Thomas 2

1 U.S. Geological Survey, Menlo Park, California
2 U.S. Geological Survey, Washington, D.C.

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.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Atmospheric and Hydrospheric Evolution on the Primitive Earth: Both secular accretion and biological and geochemical processes have affected earth's volatile envelope.
P. E. Cloud and P. E. Cloud Jr. (1968)
Science 160, 729-736
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Science. ISSN 0036-8075 (print), 1095-9203 (online)