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| index formation; index zone; key bed; key horizon; key rock; marked bed; marker; marker bed; marker formation; marker horizon; reference horizon; stratigraphic criteria; stratigraphic guide; stratigraphic marker; stratotype; structure indicator; type formation | |||
| indicator horizon | |||
| guide bed; index bed; typical floor | |||
| datum bed; horizon marker | |||
| key layer; mandatory layer; marker lamination; marker layer; standard bed; standard floor | |||
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| marker | |||
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| key bed | |||
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| standard floor | |||
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| guide bed; index bed | |||
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| guide seam | |||
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| marker bed | |||
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| marker | |||
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| horizon marker | |||
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| typical floor | |||
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| standard floor | |||
| 标准层: 86 phrases in 20 subjects |