Geochemical analysis of fluvial sediments on the banks of River Ero using inductively coupled plasma mass spectrometry illustrates their maturity, provenance and tectonic setting. The analysed sediment samples show low SiO 2 /Al 2 O 3 ratios of 2.92-2.99 (units FL_A, FL_B and FL_E) and high SiO 2 /Al 2 O 3 ratios of 4. FL_D, FL_F and FL_G). Sediments were geochemically classified as shales (units FL_A, FL_B and FL_E) and greywackes (units FL_C, FL_D, FL_F and FL_G). Ključne besede: rečni sedimenti, Eu anomalija, SW Nigerija, izvor, tektonska uvrstitev