![Outcroppings of sedimentary rock layers in the southwestern Candor Chasma region of Mars’s Valles …[Credits : NASA/JPL/Malin Space Science Systems]](http://media-2.web.britannica.com/eb-media/58/72458-004-C00A7F69.jpg)
Outcroppings of sedimentary rock layers in the southwestern Candor Chasma region of Mars’s Valles Marineris canyon system, photographed at high resolution by Mars Global Surveyor in March 1999. Some scientists have interpreted these formations as evidence that lakes once partially filled the canyons. More than 100 layers, or beds, each estimated to be about 10 metres (33 feet) thick, are exposed in the region, only part of which is seen in the image.
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