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Unusual Martian region leaves clues to planet’s past

27 September 2016 Astronomy Now

Researchers studying the geography and mineralogy of an area on Mars known as Thaumasia Planum, based on Gamma Ray Spectrometer data collected by the Mars Odyssey Orbiter launched in 2001, have found that the mountain ridge outlining Greater Thaumasia was most likely created by a chain of ancient volcanoes.