Well-preserved assemblages of calcareous nannofossils are found in Paleocene-early Eocene pelagic sediments on the north flank of the Pyrenees south of Pau, Basses Pyrenees, France. Nearly continuous exposures through the Paleocene strata at Pont Labau provide a reference section for correlation with other localities in Europe and the Americas. Forty-four species belonging to 21 genera are described in detail, using ordinary transmitted light and phase contrast illumination for general investigation, and observation of the forms between crossed polarizers and electron microscopy of carbon replicas for determination of structure. The following new families are proposed: Prinsiaceae, Heliolithaceae, Zygodiscaceae, and Fasciculithaceae. The family Coccolithaceae Kamptner, 1928, is emended. A new subfamily, Cyclococcolithoideae, is proposed, and the subfamily Coccolithoideae Kamptner, 1928, is emended. The following new genera are recognized: Conococcolithus Prinsius, and Toweius, and the following eight new species are described: Coccolithus cavus, C. apomenmoneumus, Conococcolithus minutus, Toweius craticulus, Ericsonia subpertusa, Scapholithus apertus, S. rhombiformis, and Fasciculithus schaubi.

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