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| 二叠-石炭系/纪 | |||
| 石炭一二叠纪; 石炭-二叠系 | |||
| 石炭二叠纪 | |||
| 石炭二叠过渡期 | |||
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Permo-Carboniferous : 8 phrases in 5 subjects |
| Drilling | 2 |
| Engineering geology | 3 |
| Geology | 1 |
| Hydroelectric power stations | 1 |
| Oil / petroleum | 1 |
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