Researcher Don Hood from LSU and colleagues at collaborating universities studied an strange region on Mars—an area with tall elevation called Thaumasia Planum. They analyzed the geography and mineralogy of this area they termed Greater Thaumasia,which is about the size of North America. They also studied the chemistry of this area based on Gamma Ray Spectrometer data collected by the Mars Odyssey Orbiter, which was launched in 2001. What they found was the mountain ridge that outlines Greater Thaumasia was most likely created by a chain of volcanoes. The results were published recently in the Journal of Geophysical Research-Planets.
Source: phys.org