Indeed.
If you look closely at Valles Marineris, it's easy to see that it looks completely different than a dry riverbed, which is what most people have long considered it to be.
It begins and ends abruptly, and has no visible evidence of a floodplain. Many of the 'tributaries' flowing away from it, do so at right angles to the main channel. There is also a curious sort of scalloping all along the edges of the gorge, as if some giant utensil scooped it out. In addition, there are thousands of 'craters' running parallel to it, that are strung out like beads on a string.
Check out this short video that explains electrical machining of planetary surfaces:
Interesting video. It’s believed that some of the rock debris fell to earth.