Fig. 8From: Geotechnical evaluation of gully erosion and landslides materials and their impact in Iguosa and its environs, southern Nigeriaa Shale/clay materials (SB5) acting as gliding surface in the study area (photo by Aigbadon). b Weathered shale/clay materials on the flood in the study area which act as the sliding plane in the affected areas (photo by Aigbadon)Back to article page