INSET: USGS IMAP 2208: Geologic map of the MTM 25057 and 25052 quadrangles, Kasei Valles region of Mars

Kasei Valles (fig. 1) make up the largest system of outflow channels on Mars and were a major contributor of water to Chryse Planitia. The walls and floors of the Kasei channels are terraced and grooved, closely resembling the channeled scablands of eastern Washington State that were formed by catastrophic floods probably lasting no more than a few days (Baker and Milton, 1974; Baker and...