**3. Materials and methods**

For the development of this work, a total of 16 cross-sectional profiles were selected, equidistant among themselves, along the main channel of the study area (**Figures 4** and **5**).

In order to obtain the amount of soil lost (eroded), over time, until giving rise to the gully system that predominates in Ma'adim Vallis, it was proceeded to measure, in


## **Figure 4.**

*Location of cross-section profiles, and data, in the study area.*
