Abstract
Peltoceratoides athletoides (Lahusen) is currently used in the Tethyan domain (Submediterranean province) as an index-species for two separate biochronological units: one a horizon near the top of the Callovian, the other a zone at the base of the Oxfordian. Paleontological revision of the species, from specimens collected in situ in South East France and in Normandy shows that species is strictly localized in the lowermost Oxfordian. Consequently, the Callovian horizon, originally defined in Anjou, should be renamed the Schroederi horizon. The usefulness of Peltoceratoides athletoides as an indicator of the first Oxfordian zone in the Tethyan domain, the counterpart of the Mariae zone, is confirmed. In addition, strict localization of the species makes it is possible to define a subzone and a horizon for the base of the Oxfordian, which are the boreal equivalents of the Scarburgense subzone and Scarburgense horizon. These new data contribute to build a standard West Tethyan scale entirely independant of the boreal zonation for the Upper Callovian and Lower Oxfordian.
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