"Sediments Hint at Large Ancient Martian Moon"
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"Notably, the paired dark-toned laminae (PDL) closely resemble slackwater mud drapes and double mud layers (DML) typical of tidal rhythmites on Earth. If these structures indeed represent tidal processes, they suggest the possible influence of a past Martian moon, at least 15 times the mass of Phobos."
Sediments Hint at Large Ancient Martian Moon
Regular, alternating layers in Gale Crater may have been deposited as the result of tides raised by a moon at least 18 times the mass of Phobos, a study says.Damond Benningfield (Eos)