Today's Image of Mars shows what is possibly the newest part of Cerberus Fossae. And what exactly is Cerberus Fossae?
Cerberus Fossae is a series of roughly parallel fissures created by faults which pulled the Martian crust apart in the Cerberus region, which is located at around 9°N, 197°W. These faults are the result of the formation of the Elysium Volcanic Field. They pass through preexisting features, like hills, which indicates that the faults are relatively recent.
Research suggests that the formation of these fossae released massive amounts of pressurized underground water, which led to the creation of Athabasca Valles, a large outflow channel on Mars.
Clicking on this photo of Mars will take you to the original HiRISE image, but they have yet to provide a caption.