GNGTS 2016 - Atti del 35° Convegno Nazionale

GNGTS 2016 S essione 2.2 337 of the rocks, ii) the contrast in resistance to erosion of the different rock layers (morphoselection), iii) the attitude of the bedding planes, iv) the topography and v) the presence of vegetation that may emphasize (or hide) individual beddings (Marchesini et al. , 2013). The bedding traces were used to derive information on the attitude of the bedding plane, by the intersection of the bedding traces with the local topography, visible in the stereoscopic images. The attitude of the bedding planes were grouped in 5 classes (sub-horizontal, gentle dipping, moderate, elevate, upside down). In the photo-geological map (Fig. 1), the BTs are represented by green lines, which path shows the lateral continuity of the morphological evidences of the rock layers having different competence. These evidences are widely represented in the map, particularly along the slopes where heterogeneous multi-layered sequences crop out. On the other hand, where massive and homogeneous arenaceous units crop out, or where the slopes are covered by dense tree canopies, the photointerpretation is more complex, which results in a lower density of BTs. Fig. 1 – Draft version of the photo-geological map of the Amatrice depression. (A) Amatrice, (B) Ritrosi, (C) Torrita- Scai.