OLIGOCENE (STRATIGRAPHY)
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BTPALAEOGENE (STRATIGRAPHY)
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UDC551.781.5
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Descriptor GEROLIGOZÄN (STRATIGRAPHIE)
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Descriptor ENGOLIGOCENE (STRATIGRAPHY)
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Descriptor FREOLIGOCÈNE (STRATIGRAPHIE)
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Variant GEROLIGOZAEN (STRATIGRAPHIE)
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NTCHATTIAN (STRATIGRAPHY)
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NTMENILITIC FORMATION (STRATIGRAPHY)
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NTRUPELIAN (STRATIGRAPHY)