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| index zone; indicator seam; key bed; marked bed; marker formation; marker horizon; reference lamina | |||
| datum horizon; guide bed; index bed; indicator horizon | |||
| marker bed | |||
| horizon marker | |||
| key horizon | |||
| guide seam (位); guiding bed (位); index bed (位); key bed (位); key horizon (位); key layer (位); marker bed (位); reference lamina (位) | |||
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| marker horizon | |||
| 标志层: 25 phrases in 5 subjects |
| Architecture | 1 |
| Drilling | 1 |
| Geophysics | 1 |
| Oil / petroleum | 6 |
| Technology | 16 |
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