GEOLOGICAL MAP OF STROMBOLI - SCIARA DEL FUOCO - Starting from 400 A. C. the Pizzo sopra la fossa began to form: the ridge from which all hikers observe the Strombolian activity. During what is called Eruptive Age 6a by the experts, those volcanic forms of the island were consolidated which, in principle, we see today. In 360 A.C. There was the formation of the area of San Bartolo and of the area called the Chiappe Lisce. Later, in about 355 A. C. there was the formation of Bastimento, which gives the name of the subsystem indicated by the volcanologists. After this period, the formations that shaped the island crossed that period known as the Roccette, during which the formation of the Sciara del Fuoco, of the same Roccette and the so-called Fossetta occurred (1350 D. C.).