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†Umbria Bralower & Thierstein 1989
urn:lsid:organismnames.com:name:750003
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†Umbria Bralower & Thierstein 1989
Bralower & Thierstein 1989. Calcareous nannofossil zonation of the Jurassic-Cretaceous boundary interval and correlation with the geomagnetic polarity timescale. Marine Micropaleontology, 14(1-3) 1989: 153-235