Analytical method: MS-ID
| Technique | MS-ID |
|---|---|
| Material | WHOLE ROCK |
| Mineral | none |
| Institution | UNKNOWN |
| Reference | Lange, Ian M; Zehner, Richard E (1989) Isotope data, ages and geology of the Hog Heaven volcanic field,northwestern Montana. Isochron/West, vol.54, pp.8-10, Sep 1989 |