SILURIAN (STRATIGRAPHY)
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BTPALAEOZOIC (STRATIGRAPHY)
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UDC551.733
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Descriptor GERSILUR (STRATIGRAPHIE)
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Descriptor ENGSILURIAN (STRATIGRAPHY)
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Descriptor FRESILURIEN (STRATIGRAPHIE)
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NTUPPER SILURIAN (STRATIGRAPHY)
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NTTACONIAN OROGENY (STRATIGRAPHY)
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NTLOWER SILURIAN (STRATIGRAPHY)