Is it possible for clastic sedimentary particles to deposit in the liquid environment of liquid carbon dioxide (CO₂) and eventually form sedimentary rocks similar to the earth? According to the current international understanding of Mars exploration, it is preliminarily considered that sedimentary rocks are developed on the surface of Mars, and according to satellite data, the common bedding structural characteristics similar to earth sedimentary rocks and geomorphic characteristics such as river delta plain can be seen. These features look very common on the earth's surface, but they appear on Mars, which is incredible because there is no flowing water on Mars at present. But at the poles of Mars, there is obvious dry ice. Therefore, is it possible that rivers or oceans composed of liquid carbon dioxide have appeared on Mars? Are the sedimentary rocks or sedimentary structural features on the surface of Mars formed in the sedimentary environment of liquid carbon dioxide? You are welcome to discuss. Of course, if there are practitioners, you are more welcome to express your views.