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Valley networks

At closer look, a large network of small dendritic valleys can be found all over this HRSC observation. The valleys appear to be older than the graben structures because they were not deviated by the faults and appear to directly cut through them. This area is located on the flanks of the Alba Patera volcano and the northern (right) part of the image is located much deeper than the southern side. This can well be seen on the color-coded elevation model. Thus, these valleys should run along the slopes and merge in the deepest area. This can’t be observed at this location. The valleys must therefore originate from more ancient times.