RT Journal Article T1 Sedimentación lacustre y ciclicidad: las sucesiones fluvio-lacustres del Oligoceno superior del sector SE de la cuenca del Ebro T1 Lacustrine sedimentation and cyclicity: Late Oligocene fluvio-lacustrine sequences in the SE Ebro basin A1 Barberà, X. A1 Cabrera, L. A1 Marzo, M. A1 Ripepe, M. AB A cyclostratigraphic study of Late Oligocene fluvio-lacustrine and lacustrine sequences was carried out in the Ebro basin. Fourier spectral analysis was used to analyze four stratigraphic and sedimentological parameters (thickness, colour, lithology and an estimative depth index) and was proved the appearance of periodicities of 39 and 16 to 18 ky which approximately fit the 41 ky (obliquity cycle) and 19 ky (short precession cycle). In all spectra, the obliquity cycle is a strong signal in the lacustrine intervals, but in fluvial intervals the ciclycity was concealed, likely as a consequence of overprinting of tectonic influence PB Sociedad Geológica de España YR 1996 FD 1996 LK http://hdl.handle.net/10272/12834 UL http://hdl.handle.net/10272/12834 LA spa DS Repositorio Institucional de la Universidad de Huelva RD 15 jun 2026