Widespread phenomena of submarine erosion and resedimentation, which are present in the Middle-Lower Jurassic of Belluno and Carnian Prealps, are pointed out. The phenomena in question are slump structures, slump conglomerates, slide breccias with a lens geometry, sometimes filling submarine channels or gullies; they occur near the hingeline which divides a neritic carbonate platform from a pelagic bathial basin. The writer refers these sinsedimentary perturbations to the tectogenic activity which affected during that time the structural elements of the Southern Alps.