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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 |