Analytical method: SPEC
| Technique | SPEC |
|---|---|
| Material | WHOLE ROCK |
| Mineral | none |
| Comment | Leung Mei, analyst |
| Institution | USGS DENVER, DENVER, CO, USA |
| Reference | Anonymous (1981) Ages of igneous rocks in the South Park-Breckenridge region, Colorado, and their relation to the tectonic history of the Front-Range uplift. U. S. Geological Survey Professional Paper, Report: P 1199 A-E, 1981 |