In the town of Allumiere in the territory close to the La Bianca district, there  is a prehistoric standing stones, known as the stele of Rocchette (from the nearby farmhouse of the same name). The shape of the structure is a box for 250 x 122 x 55 cm.  The sedimentary rock (sandstone) was roughly carved to get that form.  This stone column was erected to be stacked in a rectangular pit lined with stone slabs of the same type.  The base consists of at least four parts and has surface dimensions of 150 x 190 x 41 cm.  Visual analysis is a sign of hardening of the modern era, perhaps done to strengthen the structure that in part has been eroded by time.  Judging from the fragments inspected, initially standing stones had to be at least three meters high.  There is no trace of any bibliographic excavations nearby, but judging the type of structure similar to those in Europe, the stele should go back to megalithic period between 4000-3000 B.C. (perhaps at the turn of the Neolithic-Copper Age).  The menhir is not a cardinal orientation and being between different prehistoric sites (Tolfaccia, Tufarelle, Le Macine, Macchia della Codata, Castellina del Marangone) is perhaps more reasonable to believe that it acted as an indicator of the path instead of votive altar.  The stele along with other similar facilities in the territory of the mountains of Tolfa attests to the presence of megalithic villages developed and connected to each other


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