Analytical method: UNKNOWN
| Technique | UNKNOWN |
|---|---|
| Material | WHOLE ROCK |
| Mineral | none |
| Comment | Total Fe as FeOT |
| Reference | Laughlin, A W; Kress, V C; Aldrich, M J (1982) K-Ar ages of dike rocks, Big Bend National Park, Texas. Isochron/West. 35; Pages 17-18. 1982. . |