It's a large square slab lying on the grass, probably cut and transported in the current position. It shows one of the most impressive examples of a complex web of cup-marks and channels. The five larger cup-marks in the lower part (18 cm large, 8 cm deep) are very smooth: they have been surely executed by a metal tool, having vertical walls and flat bottom. The branching of the channels leads toward the lower border, where the largest cup-marks are aligned. Efferent channels connect these cup-marks outside the lower border. There is a very similar rock at Menolzio (a square cup-marked stone, but without channels, http://rupestre.net/archiv/ar6.htm), just on the other side of the ridge which divides the Susa valley from the Chisone valley, but at a lower altitude.

The dating of the cup-marked stone has always been controversial. Various elements anyway make probable an Iron Age dating for the similar Alpine cup-marks, as an iron tool is needed for deep and vertical- wall engravings, exactly like in this case. The study of the superimpositions in the Rupe Magna (Valtellina - I), where cup-marks cover some warriors figures, clarify an Iron Age dating, also confirmed by the Susa (I) cup-marks, executed over a rock cut with an iron pick and overlapped by a Roman building. In this case the footprint-like basin recalls the middle Iron Age footprints of Valcamonica and the first Iron Age burial slab of Sesto Calende, engraved with cup-marks and footprints.