W Willems (1979)
Preliminary note on the biostratigraphy of the Ieper Formation (Lower Eocene) in the Kallo boring based on benthic foraminifera. In: Project 124. The Northwest European Tertiary basin. R. Vinken,ed. In cooperation with the IGCP-National Committee of FRG
IUGS UNESCO IGCP, vol. Report No. 5 July 1979 p. 17-18.
17411, .27, O, BRAB3, EOC, PALMIC
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