| |||
chronologic age | |||
chronological age | |||
stratigraphic time unit; stratigraphical time unit | |||
| |||
chronological time |
地 层 年代 : 41 phrases in 9 subjects |
Agriculture | 1 |
Desert science | 2 |
Drilling | 1 |
Earth sciences | 2 |
Engineering geology | 4 |
General | 2 |
Geology | 6 |
Oil / petroleum | 13 |
Technology | 10 |