LOWER SILURIAN (STRATIGRAPHY)
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BTSILURIAN (STRATIGRAPHY)
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UDC551.733.31
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Descriptor GERUNTERSILUR (STRATIGRAPHIE)
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Descriptor ENGLOWER SILURIAN (STRATIGRAPHY)
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Descriptor FRESILURIEN/INFERIEUR (STRATIGRAPHIE)
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Variant GERSILUR/UNTERES SILUR (STRATIGRAPHIE)
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Variant ENGSILURIAN/LOWER SILURIAN (STRATIGRAPHY)
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NTLLANDOVERIAN (STRATIGRAPHY)
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NTWENLOCKIAN (STRATIGRAPHY)