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Old Features and New
This image covers a portion of a typical impact crater in Terra Sirenum at about 40 degrees south latitude on Mars.
Stratigraphy in Cross Crater
Cross Crater, about 65 kilometers in diameter, is located in the highlands of the Terra Sirenum region of Mars.
Possible Clays and Chlorides near Columbus Crater
Data from other instruments, such as THEMIS and CRISM, imply that chlorides are present here; the CRISM data reveal that iron/magnesium clays are also present.