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A Pleistocene terraced fluvial succession is found on the northern slope of the Torino Hill. This succession consists of many relics of flat surfaces, separated by scarps, often associated with sandy and silty deposits, perched from 30 to 400 m on the Po Plain. Terraced surfaces at high levels are more deformed, dissected and mostly deprived of their original sediments; lower ones are less deformed, more continuous and preserved. In the western sector of the area, these surfaces form a declining terraced succession towards the plain. In the eastern sector they form a terraced succession entrenched within the relief. The succession is not linked either to the present hilly watercourses, or to the Po River now developed to the north of hilly relief, because during the Pleistocene the river flowed south of the Torino Hill. On the contrary, it is connected with modification by ancient Northern Piemonte Plain watercourses. This succession is the result of deformation of original plain sectors prior to the Po River shifting north of the relief. The comparison of chronological reference of fluvial morphological features and sediments with their altimetric distribution, suggests a mean uplift of the Torino Hill of about 1 mm/year. The present morphology connected with this evolution favours landslide phenomena. |
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