The drawings were made with the graffiti technique, that is by engraving the rock with stone or iron tools. The type of engraving can be thin, which is called stringy, or with a continuous V or U shaped furrow, which is called polissoir engraving. The repertory of images is broad and their chronological dating is complex. The drawings are rather symbolic than descriptive: there are many crosses, cup marks, crossbows and geometric shapes. Few are the animal drawings: it is possible to recognize a little horse and a fish. The chronological span is still uncertain. However, some of the drawings can be referred to the late Iron age (end of the I millennium B.C.): it is the case of shapes such as huts, topographic drawings, stairs and five-pointed stars, all symbols which appear in coeval rock art. The cup marks appear either individually or associated with other images in various arrangements, and they are still difficult to date. The late Middle Ages symbols prevail, such as crosses and crossbows. The few anthropomorphic drawings do not share stylistic affinities and might have been produced in rather recent times.