Uzboi Vallis is believed to have been formed by running water. It is believed that layers were formed on the floor of Uzboi Vallis (as shown in the HiRISE image below) when drainage was blocked by the impact that formed Holden Crater to the north. Eventually the lake in the area of Uzboi Vallis went high enough to overtop the rim of Holden. The water then eroded the deposits to expose the layers as they are today. The sediments that make up the layers appear to be coarse in size, suggesting they were probably formed by a rapid flow.[1] [2] [3] [4]
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