Impacts of sediment connectivity on Holocene alluvial records across a Mediterranean basin (Guadalentín River, SE-Spain)

•Spatial-temporal changes of sediment (dis)connectivity controlled alluvial deposition.•Vertically stacked alluvial sequences are dominant in poorly connected infill valleys.•Stair-case fill terraces due to cut-and-fill cycles occurred on connected reaches.•Comparison of alluvial chronology provide the timing of connectivity patterns.•Fluvial connectivity throughout the catchment was only obtained in the Late Holocene.