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More strange symbols on the surface of Mars:

Resembling corkscrew snail shells, these interesting patterns are actually rare lava flows seen for the first time on Mars.

NASA’s HiRISE spacecraft, currently in orbit around Mars, spotted the formations in an area called Athabasca Valles, a tear-shaped landform thought to have been created by catastrophic flooding.

Such coils are occasionally seen on Earth, mostly in the ropey pahoehoe lava flows on the Big Island of Hawaii or in the submarine Galapagos Rift on the bottom of the Pacific.

The Martian lava coils are about 100 feet across — much larger than their terrestrial counterparts, which are often only a foot or so in size.

Full story at Wired. (h/t @GrailSeeker)