Abstract
The rare-earth elements (/LEE) do not fractionate during sedimentary processes, and their secondary remobilisation is not significant, therefore they provide information on the source area, since the sedimentary particles conserve the chemical record of the source (e.g. McLennan, 1989; Condie, 1991). In the Cretaceous-Tertiary boundary (KTB) they can provide information on the source area and depositional conditions. We have studied different sequences that belong to the Betic Cordilleras (Spain): 'Agost' (A) and 'Caravaca' (CA), and Basque Cantabrian basin (Spain and France): 'Sopelana' (SO), 'Monte Urko' (URT), 'Zumaya' (ZU), 'Hendaye' (HY) and 'Biarritz' (B).
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