Residual forms of erosion are located along the road network from Skala to Poros in the area of Eliou-Pronnon. These forms are remnant erosion geomorphs of Oligocene-Miocene conglomerate limestones of the Pre-Apulian zone characterized as marine notches.These sea notches were formed due to sea-level change, being indicators of this change, either due to eustatism or due to the tectonic uplift that followed their formation. Source: (www.kefaloniageopark.gr)