| Summary: | A nummulitid biozonation for the Upper Paleocene-Lower Eocene Pyrenean Basin is proposed in this work, The main contributions are: a) a new biozone proposed for the early Thanetian, b) a better characterization of the late Thanetian biozone, and c) the recognition of two different biozones within the Lower Ilerdian.The nummulitid biozones established for the Pyrenean Upper Paleocene-Lower Eocene interval were correlated with the corresponding larger foraminiferal biozones Shallow Benthic Zones (SBZ) and integrated in the standard Paleocene-Eocene Time Scale on the basis of magnetostratigraphic data from the Pyrenean Basin and by correlation with the biozonation of calcareous nannoplankton and planktonic foraminifera in the Eastern and Central part of Tethys.The new biozones defined for tbe Pyrenean Upper Paleocene-Lower Eocene are: Nummulites heberti-Ranikothalia sindensis (early Thanetian), N. catari-Assilina yvettae-A. azilensis (late Thanetian), N. gamardensis-A. dandotica (early Ilerdian l), N. bigurdensis-A. aff. Prisca (early Ilerdian 2), N. carcasonensis-A. arenensis (middle Ilerdian l), N. exilis-A. leymeriei (middle Ilerdian 2), N. involutus-A. pomeroli (late Ilerdian), N. planulatus-N. burdigalensis burdigalensis-A. placentula (early Cuisian), N. praelaevigatus-N, cantabricus-A. laxispira (middle Cuisian), and N. manfredi-N. campesinus-A. mnior (late Cuisian).
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