Variations to calcareous nannofossil CaCO3 content during the middle Eocene C21r-H6 hyperthermal event (~ 47.4 Ma) in the Gorrondatxe section (Bay of Biscay, western Pyrenees)

1. Intxauspe-Zubiaurre, B.
2. Flores, J.-A.
3. Payros, A.