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The northern margin of the Mesozoic-Cenozoic Lusitanian (Western Portuguese) Basin is known mostly from borehole sections. Mineralogical studies of the subsurface Cretaceous are based on XRD, XRF, TEM and Flame-spectroscopy of cuttings. Clay mineralogy varies stratigraphically, with kaolinite dominating in the Aptian/Albian/Cenomanian and late Turonian-early Coniacian. Illite is common in the late...