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.
Citation Information
| Publication Year | 1963 |
|---|---|
| Title | Glauconite from the precambrian belt series, Montana |
| Authors | R. A. Gulbrandsen, S. S. Goldich, H.H. Thomas |
| Publication Type | Article |
| Publication Subtype | Journal Article |
| Series Title | Science |
| Index ID | 70010685 |
| Record Source | USGS Publications Warehouse |