| through stratigraphic and geochemical investigations | 6 | cause |
| manually | 3 | manner |
| previously | 2 | temporal |
| sequence → be → examined | 21 |
| sequence → be → studied | 16 |
| sequence → be → assessed | 6 |
| sequence → be → investigated | 4 |
| sequence → be examined in → detail | 3 |
| sequence → be → examination | 3 |
| negative | neutral | positive |
| 0.069 | 0.808 | 0.123 |
| Raw frequency | 53 |
| Normalized frequency | 0.533 |
| Modifier score | 1.000 |
| Perplexity | 99.332 |