Have we ever seen river rocks on Mars? I found one image and an article: https://www.zmescience.com/science/geology/curiosity-photographs-river-like-rounded-r

Have we ever seen river rocks on Mars? I found one image and an article: https://www.zmescience.com/science/geology/curiosity-photographs-river-like-rounded-rocks/ https://www.zmescience.com/science/geology/curiosity-photogr... ...but that says those most certainly are not river rocks.