Analytical method: UNKNOWN
| Technique | UNKNOWN |
|---|---|
| Material | WHOLE ROCK |
| Mineral | none |
| Institution | Unknown, Unknown, USA |
| Reference | Gastil, G; Krummenacher, D; Minch, J (1979) The record of Cenozoic volcanism around the Gulf of California. Geological Society of America Bulletin. 90; 9, Pages I 839-I 857. 1979. |